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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
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<title>KernelBlockDevices: libblockdev Reference Manual</title>
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<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#libblockdev-KernelBlockDevices.description" class="shortcut">Description</a></span>
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<div class="refentry">
<a name="libblockdev-KernelBlockDevices"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libblockdev-KernelBlockDevices.top_of_page"></a>KernelBlockDevices</span></h2>
<p>KernelBlockDevices — plugin for operations with kernel block devices</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="libblockdev-KernelBlockDevices.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-check-deps" title="bd_kbd_check_deps ()">bd_kbd_check_deps</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-init" title="bd_kbd_init ()">bd_kbd_init</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-close" title="bd_kbd_close ()">bd_kbd_close</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-bcache-attach" title="bd_kbd_bcache_attach ()">bd_kbd_bcache_attach</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-bcache-create" title="bd_kbd_bcache_create ()">bd_kbd_bcache_create</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-bcache-destroy" title="bd_kbd_bcache_destroy ()">bd_kbd_bcache_destroy</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-bcache-detach" title="bd_kbd_bcache_detach ()">bd_kbd_bcache_detach</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gchar</span> *
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-bcache-get-backing-device" title="bd_kbd_bcache_get_backing_device ()">bd_kbd_bcache_get_backing_device</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gchar</span> *
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-bcache-get-cache-device" title="bd_kbd_bcache_get_cache_device ()">bd_kbd_bcache_get_cache_device</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDBcacheMode" title="enum BDKBDBcacheMode"><span class="returnvalue">BDKBDBcacheMode</span></a>
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-bcache-get-mode" title="bd_kbd_bcache_get_mode ()">bd_kbd_bcache_get_mode</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDBcacheMode" title="enum BDKBDBcacheMode"><span class="returnvalue">BDKBDBcacheMode</span></a>
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-bcache-get-mode-from-str" title="bd_kbd_bcache_get_mode_from_str ()">bd_kbd_bcache_get_mode_from_str</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <span class="returnvalue">gchar</span> *
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-bcache-get-mode-str" title="bd_kbd_bcache_get_mode_str ()">bd_kbd_bcache_get_mode_str</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-bcache-set-mode" title="bd_kbd_bcache_set_mode ()">bd_kbd_bcache_set_mode</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDBcacheStats" title="BDKBDBcacheStats"><span class="returnvalue">BDKBDBcacheStats</span></a> *
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-bcache-stats-copy" title="bd_kbd_bcache_stats_copy ()">bd_kbd_bcache_stats_copy</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-bcache-stats-free" title="bd_kbd_bcache_stats_free ()">bd_kbd_bcache_stats_free</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDBcacheStats" title="BDKBDBcacheStats"><span class="returnvalue">BDKBDBcacheStats</span></a> *
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-bcache-status" title="bd_kbd_bcache_status ()">bd_kbd_bcache_status</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">GQuark</span>
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-error-quark" title="bd_kbd_error_quark ()">bd_kbd_error_quark</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-zram-create-devices" title="bd_kbd_zram_create_devices ()">bd_kbd_zram_create_devices</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-zram-destroy-devices" title="bd_kbd_zram_destroy_devices ()">bd_kbd_zram_destroy_devices</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-zram-add-device" title="bd_kbd_zram_add_device ()">bd_kbd_zram_add_device</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-zram-remove-device" title="bd_kbd_zram_remove_device ()">bd_kbd_zram_remove_device</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDZramStats" title="BDKBDZramStats"><span class="returnvalue">BDKBDZramStats</span></a> *
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-zram-get-stats" title="bd_kbd_zram_get_stats ()">bd_kbd_zram_get_stats</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDZramStats" title="BDKBDZramStats"><span class="returnvalue">BDKBDZramStats</span></a> *
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-zram-stats-copy" title="bd_kbd_zram_stats_copy ()">bd_kbd_zram_stats_copy</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-zram-stats-free" title="bd_kbd_zram_stats_free ()">bd_kbd_zram_stats_free</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libblockdev-KernelBlockDevices.html#bd-kbd-is-tech-avail" title="bd_kbd_is_tech_avail ()">bd_kbd_is_tech_avail</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libblockdev-KernelBlockDevices.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDBcacheMode" title="enum BDKBDBcacheMode">BDKBDBcacheMode</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDBcacheStats" title="BDKBDBcacheStats">BDKBDBcacheStats</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDError" title="enum BDKBDError">BDKBDError</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDZramStats" title="BDKBDZramStats">BDKBDZramStats</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-ERROR:CAPS" title="BD_KBD_ERROR">BD_KBD_ERROR</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDTech" title="enum BDKBDTech">BDKBDTech</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDTechMode" title="enum BDKBDTechMode">BDKBDTechMode</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libblockdev-KernelBlockDevices.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;kbd.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="libblockdev-KernelBlockDevices.description"></a><h2>Description</h2>
<p>A plugin for operations with kernel block devices.</p>
</div>
<div class="refsect1">
<a name="libblockdev-KernelBlockDevices.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="bd-kbd-check-deps"></a><h3>bd_kbd_check_deps ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
bd_kbd_check_deps ();</pre>
<div class="refsect3">
<a name="bd-kbd-check-deps.returns"></a><h4>Returns</h4>
<p> whether the plugin's runtime dependencies are satisfied or not</p>
<p>Function checking plugin's runtime dependencies.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-init"></a><h3>bd_kbd_init ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
bd_kbd_init ();</pre>
<p>Initializes the plugin. **This function is called automatically by the
library's initialization functions.**</p>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-close"></a><h3>bd_kbd_close ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
bd_kbd_close ();</pre>
<p>Cleans up after the plugin. **This function is called automatically by the
library's functions that unload it.**</p>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-bcache-attach"></a><h3>bd_kbd_bcache_attach ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
bd_kbd_bcache_attach (<em class="parameter"><code>const <span class="type">gchar</span> *c_set_uuid</code></em>,
                      <em class="parameter"><code>const <span class="type">gchar</span> *bcache_device</code></em>,
                      <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<div class="refsect3">
<a name="bd-kbd-bcache-attach.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>c_set_uuid</p></td>
<td class="parameter_description"><p>cache set UUID of the cache to attach</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>bcache_device</p></td>
<td class="parameter_description"><p>bcache device to attach <em class="parameter"><code>c_set_uuid</code></em>
cache to</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>place to store error (if any). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="bd-kbd-bcache-attach.returns"></a><h4>Returns</h4>
<p> whether the <em class="parameter"><code>c_set_uuid</code></em>
cache was successfully attached to <em class="parameter"><code>bcache_device</code></em>
or not</p>
<p>Tech category: <a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-BCACHE:CAPS"><code class="literal">BD_KBD_TECH_BCACHE</code></a>-<a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-MODE-MODIFY:CAPS"><code class="literal">BD_KBD_TECH_MODE_MODIFY</code></a></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-bcache-create"></a><h3>bd_kbd_bcache_create ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
bd_kbd_bcache_create (<em class="parameter"><code>const <span class="type">gchar</span> *backing_device</code></em>,
                      <em class="parameter"><code>const <span class="type">gchar</span> *cache_device</code></em>,
                      <em class="parameter"><code>const <a class="link" href="libblockdev-Utils.html#BDExtraArg" title="BDExtraArg"><span class="type">BDExtraArg</span></a> **extra</code></em>,
                      <em class="parameter"><code>const <span class="type">gchar</span> **bcache_device</code></em>,
                      <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<div class="refsect3">
<a name="bd-kbd-bcache-create.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>backing_device</p></td>
<td class="parameter_description"><p>backing (slow) device of the cache</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cache_device</p></td>
<td class="parameter_description"><p>cache (fast) device of the cache</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>extra</p></td>
<td class="parameter_description"><p>extra options for the creation (right now
passed to the 'make-bcache' utility). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> zero-terminated=1]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>bcache_device</p></td>
<td class="parameter_description"><p>place to store the name of the new bcache device (if any). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>place to store error (if any). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="bd-kbd-bcache-create.returns"></a><h4>Returns</h4>
<p> whether the bcache device was successfully created or not</p>
<p>Tech category: <a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-BCACHE:CAPS"><code class="literal">BD_KBD_TECH_BCACHE</code></a>-<a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-MODE-CREATE:CAPS"><code class="literal">BD_KBD_TECH_MODE_CREATE</code></a></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-bcache-destroy"></a><h3>bd_kbd_bcache_destroy ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
bd_kbd_bcache_destroy (<em class="parameter"><code>const <span class="type">gchar</span> *bcache_device</code></em>,
                       <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<div class="refsect3">
<a name="bd-kbd-bcache-destroy.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>bcache_device</p></td>
<td class="parameter_description"><p>bcache device to destroy</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>place to store error (if any). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="bd-kbd-bcache-destroy.returns"></a><h4>Returns</h4>
<p> whether the bcache device <em class="parameter"><code>bcache_device</code></em>
was successfully destroyed or not</p>
<p>Tech category: <a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-BCACHE:CAPS"><code class="literal">BD_KBD_TECH_BCACHE</code></a>-<a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-MODE-DESTROY:CAPS"><code class="literal">BD_KBD_TECH_MODE_DESTROY</code></a></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-bcache-detach"></a><h3>bd_kbd_bcache_detach ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
bd_kbd_bcache_detach (<em class="parameter"><code>const <span class="type">gchar</span> *bcache_device</code></em>,
                      <em class="parameter"><code><span class="type">gchar</span> **c_set_uuid</code></em>,
                      <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<div class="refsect3">
<a name="bd-kbd-bcache-detach.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>bcache_device</p></td>
<td class="parameter_description"><p>bcache device to detach the cache from</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>c_set_uuid</p></td>
<td class="parameter_description"><p>cache set UUID of the detached cache. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>place to store error (if any). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="bd-kbd-bcache-detach.returns"></a><h4>Returns</h4>
<p> whether the bcache device <em class="parameter"><code>bcache_device</code></em>
was successfully destroyed or not</p>
<p>Note: Flushes the cache first.</p>
<p>Tech category: <a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-BCACHE:CAPS"><code class="literal">BD_KBD_TECH_BCACHE</code></a>-<a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-MODE-MODIFY:CAPS"><code class="literal">BD_KBD_TECH_MODE_MODIFY</code></a></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-bcache-get-backing-device"></a><h3>bd_kbd_bcache_get_backing_device ()</h3>
<pre class="programlisting"><span class="returnvalue">gchar</span> *
bd_kbd_bcache_get_backing_device (<em class="parameter"><code>const <span class="type">gchar</span> *bcache_device</code></em>,
                                  <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<div class="refsect3">
<a name="bd-kbd-bcache-get-backing-device.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>bcache_device</p></td>
<td class="parameter_description"><p>Bcache device to get the backing device for</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>place to store error (if any). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="bd-kbd-bcache-get-backing-device.returns"></a><h4>Returns</h4>
<p>name of the backing device of the <em class="parameter"><code>bcache_device</code></em>
or <code class="literal">NULL</code> if failed to determine (<em class="parameter"><code>error</code></em>
is populated)</p>
<p>Tech category: <a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-BCACHE:CAPS"><code class="literal">BD_KBD_TECH_BCACHE</code></a>-<a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-MODE-QUERY:CAPS"><code class="literal">BD_KBD_TECH_MODE_QUERY</code></a>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-bcache-get-cache-device"></a><h3>bd_kbd_bcache_get_cache_device ()</h3>
<pre class="programlisting"><span class="returnvalue">gchar</span> *
bd_kbd_bcache_get_cache_device (<em class="parameter"><code>const <span class="type">gchar</span> *bcache_device</code></em>,
                                <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<div class="refsect3">
<a name="bd-kbd-bcache-get-cache-device.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>bcache_device</p></td>
<td class="parameter_description"><p>Bcache device to get the cache device for</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>place to store error (if any). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="bd-kbd-bcache-get-cache-device.returns"></a><h4>Returns</h4>
<p>name of the cache device of the <em class="parameter"><code>bcache_device</code></em>
or <code class="literal">NULL</code> if failed to determine (<em class="parameter"><code>error</code></em>
is populated)</p>
<p>Note: returns the name of the first cache device of <em class="parameter"><code>bcache_device</code></em>
(in case
there are more)</p>
<p>Tech category: <a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-BCACHE:CAPS"><code class="literal">BD_KBD_TECH_BCACHE</code></a>-<a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-MODE-QUERY:CAPS"><code class="literal">BD_KBD_TECH_MODE_QUERY</code></a>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-bcache-get-mode"></a><h3>bd_kbd_bcache_get_mode ()</h3>
<pre class="programlisting"><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDBcacheMode" title="enum BDKBDBcacheMode"><span class="returnvalue">BDKBDBcacheMode</span></a>
bd_kbd_bcache_get_mode (<em class="parameter"><code>const <span class="type">gchar</span> *bcache_device</code></em>,
                        <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<div class="refsect3">
<a name="bd-kbd-bcache-get-mode.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>bcache_device</p></td>
<td class="parameter_description"><p>device to get mode of</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>place to store error (if any). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="bd-kbd-bcache-get-mode.returns"></a><h4>Returns</h4>
<p> current mode of the <em class="parameter"><code>bcache_device</code></em>
</p>
<p>Tech category: <a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-BCACHE:CAPS"><code class="literal">BD_KBD_TECH_BCACHE</code></a>-<a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-MODE-QUERY:CAPS"><code class="literal">BD_KBD_TECH_MODE_QUERY</code></a></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-bcache-get-mode-from-str"></a><h3>bd_kbd_bcache_get_mode_from_str ()</h3>
<pre class="programlisting"><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDBcacheMode" title="enum BDKBDBcacheMode"><span class="returnvalue">BDKBDBcacheMode</span></a>
bd_kbd_bcache_get_mode_from_str (<em class="parameter"><code>const <span class="type">gchar</span> *mode_str</code></em>,
                                 <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<div class="refsect3">
<a name="bd-kbd-bcache-get-mode-from-str.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>mode_str</p></td>
<td class="parameter_description"><p>string representation of mode</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>place to store error (if any). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="bd-kbd-bcache-get-mode-from-str.returns"></a><h4>Returns</h4>
<p> mode matching the <em class="parameter"><code>mode_str</code></em>
given or <a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-MODE-UNKNOWN:CAPS"><code class="literal">BD_KBD_MODE_UNKNOWN</code></a> in case of no match</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-bcache-get-mode-str"></a><h3>bd_kbd_bcache_get_mode_str ()</h3>
<pre class="programlisting">const <span class="returnvalue">gchar</span> *
bd_kbd_bcache_get_mode_str (<em class="parameter"><code><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDBcacheMode" title="enum BDKBDBcacheMode"><span class="type">BDKBDBcacheMode</span></a> mode</code></em>,
                            <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<div class="refsect3">
<a name="bd-kbd-bcache-get-mode-str.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>mode</p></td>
<td class="parameter_description"><p>mode to get string representation of</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>place to store error (if any). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="bd-kbd-bcache-get-mode-str.returns"></a><h4>Returns</h4>
<p>string representation of <em class="parameter"><code>mode</code></em>
or <code class="literal">NULL</code> in case of error</p>
<p>Tech category: always available. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-bcache-set-mode"></a><h3>bd_kbd_bcache_set_mode ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
bd_kbd_bcache_set_mode (<em class="parameter"><code>const <span class="type">gchar</span> *bcache_device</code></em>,
                        <em class="parameter"><code><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDBcacheMode" title="enum BDKBDBcacheMode"><span class="type">BDKBDBcacheMode</span></a> mode</code></em>,
                        <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<div class="refsect3">
<a name="bd-kbd-bcache-set-mode.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>bcache_device</p></td>
<td class="parameter_description"><p>bcache device to set mode of</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mode</p></td>
<td class="parameter_description"><p>mode to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>place to store error (if any). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="bd-kbd-bcache-set-mode.returns"></a><h4>Returns</h4>
<p> whether the mode was successfully set or not</p>
<p>Tech category: <a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-BCACHE:CAPS"><code class="literal">BD_KBD_TECH_BCACHE</code></a>-<a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-MODE-MODIFY:CAPS"><code class="literal">BD_KBD_TECH_MODE_MODIFY</code></a></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-bcache-stats-copy"></a><h3>bd_kbd_bcache_stats_copy ()</h3>
<pre class="programlisting"><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDBcacheStats" title="BDKBDBcacheStats"><span class="returnvalue">BDKBDBcacheStats</span></a> *
bd_kbd_bcache_stats_copy (<em class="parameter"><code><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDBcacheStats" title="BDKBDBcacheStats"><span class="type">BDKBDBcacheStats</span></a> *data</code></em>);</pre>
<p>Creates a new copy of <em class="parameter"><code>data</code></em>
.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-bcache-stats-free"></a><h3>bd_kbd_bcache_stats_free ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
bd_kbd_bcache_stats_free (<em class="parameter"><code><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDBcacheStats" title="BDKBDBcacheStats"><span class="type">BDKBDBcacheStats</span></a> *data</code></em>);</pre>
<p>Frees <em class="parameter"><code>data</code></em>
.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-bcache-status"></a><h3>bd_kbd_bcache_status ()</h3>
<pre class="programlisting"><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDBcacheStats" title="BDKBDBcacheStats"><span class="returnvalue">BDKBDBcacheStats</span></a> *
bd_kbd_bcache_status (<em class="parameter"><code>const <span class="type">gchar</span> *bcache_device</code></em>,
                      <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<div class="refsect3">
<a name="bd-kbd-bcache-status.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>bcache_device</p></td>
<td class="parameter_description"><p>bcache device to get status for</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>place to store error (if any). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="bd-kbd-bcache-status.returns"></a><h4>Returns</h4>
<p>status of the <em class="parameter"><code>bcache_device</code></em>
or <code class="literal">NULL</code> in case of
error (<em class="parameter"><code>error</code></em>
is set)</p>
<p>Tech category: <a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-BCACHE:CAPS"><code class="literal">BD_KBD_TECH_BCACHE</code></a>-<a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-MODE-QUERY:CAPS"><code class="literal">BD_KBD_TECH_MODE_QUERY</code></a>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-error-quark"></a><h3>bd_kbd_error_quark ()</h3>
<pre class="programlisting"><span class="returnvalue">GQuark</span>
bd_kbd_error_quark (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-zram-create-devices"></a><h3>bd_kbd_zram_create_devices ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
bd_kbd_zram_create_devices (<em class="parameter"><code><span class="type">guint64</span> num_devices</code></em>,
                            <em class="parameter"><code>const <span class="type">guint64</span> *sizes</code></em>,
                            <em class="parameter"><code>const <span class="type">guint64</span> *nstreams</code></em>,
                            <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<div class="refsect3">
<a name="bd-kbd-zram-create-devices.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>num_devices</p></td>
<td class="parameter_description"><p>number of devices to create</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>sizes</p></td>
<td class="parameter_description"><p>requested sizes (in bytes) for created zRAM
devices. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> zero-terminated=1]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>nstreams</p></td>
<td class="parameter_description"><p>numbers of streams for created
zRAM devices. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> zero-terminated=1]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>place to store error (if any). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="bd-kbd-zram-create-devices.returns"></a><h4>Returns</h4>
<p> whether <em class="parameter"><code>num_devices</code></em>
zRAM devices were successfully created or not</p>
<p>**Lengths of <em class="parameter"><code>size</code></em>
and <em class="parameter"><code>nstreams</code></em>
(if given) have to be &gt;= <em class="parameter"><code>num_devices</code></em>
!**</p>
<p>Tech category: <a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-ZRAM:CAPS"><code class="literal">BD_KBD_TECH_ZRAM</code></a>-<a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-MODE-CREATE:CAPS"><code class="literal">BD_KBD_TECH_MODE_CREATE</code></a></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-zram-destroy-devices"></a><h3>bd_kbd_zram_destroy_devices ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
bd_kbd_zram_destroy_devices (<em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<div class="refsect3">
<a name="bd-kbd-zram-destroy-devices.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>place to store error (if any). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="bd-kbd-zram-destroy-devices.returns"></a><h4>Returns</h4>
<p> whether zRAM devices were successfully destroyed or not</p>
<p>The only way how to destroy zRAM device right now is to unload the 'zram'
module and thus destroy all of them. That's why this function doesn't allow
specification of which devices should be destroyed.</p>
<p>Tech category: <a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-ZRAM:CAPS"><code class="literal">BD_KBD_TECH_ZRAM</code></a>-<a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-MODE-DESTROY:CAPS"><code class="literal">BD_KBD_TECH_MODE_DESTROY</code></a></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-zram-add-device"></a><h3>bd_kbd_zram_add_device ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
bd_kbd_zram_add_device (<em class="parameter"><code><span class="type">guint64</span> size</code></em>,
                        <em class="parameter"><code><span class="type">guint64</span> nstreams</code></em>,
                        <em class="parameter"><code><span class="type">gchar</span> **device</code></em>,
                        <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<div class="refsect3">
<a name="bd-kbd-zram-add-device.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>size of the zRAM device to add</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>nstreams</p></td>
<td class="parameter_description"><p>number of streams to use for the new device (or 0 to use the defaults)</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>device</p></td>
<td class="parameter_description"><p>place to store the name of the newly added device. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>place to store error (if any). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="bd-kbd-zram-add-device.returns"></a><h4>Returns</h4>
<p> whether a new zRAM device was added or not</p>
<p>Tech category: <a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-ZRAM:CAPS"><code class="literal">BD_KBD_TECH_ZRAM</code></a>-<a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-MODE-MODIFY:CAPS"><code class="literal">BD_KBD_TECH_MODE_MODIFY</code></a></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-zram-remove-device"></a><h3>bd_kbd_zram_remove_device ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
bd_kbd_zram_remove_device (<em class="parameter"><code>const <span class="type">gchar</span> *device</code></em>,
                           <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<div class="refsect3">
<a name="bd-kbd-zram-remove-device.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>device</p></td>
<td class="parameter_description"><p>zRAM device to remove</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>place to store error (if any). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="bd-kbd-zram-remove-device.returns"></a><h4>Returns</h4>
<p> whether the <em class="parameter"><code>device</code></em>
was successfully removed or not</p>
<p>Tech category: <a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-ZRAM:CAPS"><code class="literal">BD_KBD_TECH_ZRAM</code></a>-<a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-MODE-MODIFY:CAPS"><code class="literal">BD_KBD_TECH_MODE_MODIFY</code></a></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-zram-get-stats"></a><h3>bd_kbd_zram_get_stats ()</h3>
<pre class="programlisting"><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDZramStats" title="BDKBDZramStats"><span class="returnvalue">BDKBDZramStats</span></a> *
bd_kbd_zram_get_stats (<em class="parameter"><code>const <span class="type">gchar</span> *device</code></em>,
                       <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<div class="refsect3">
<a name="bd-kbd-zram-get-stats.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>device</p></td>
<td class="parameter_description"><p>zRAM device to get stats for</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>place to store error (if any). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="bd-kbd-zram-get-stats.returns"></a><h4>Returns</h4>
<p>statistics for the zRAM device</p>
<p>Tech category: <a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-ZRAM:CAPS"><code class="literal">BD_KBD_TECH_ZRAM</code></a>-<a class="link" href="libblockdev-KernelBlockDevices.html#BD-KBD-TECH-MODE-QUERY:CAPS"><code class="literal">BD_KBD_TECH_MODE_QUERY</code></a>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-zram-stats-copy"></a><h3>bd_kbd_zram_stats_copy ()</h3>
<pre class="programlisting"><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDZramStats" title="BDKBDZramStats"><span class="returnvalue">BDKBDZramStats</span></a> *
bd_kbd_zram_stats_copy (<em class="parameter"><code><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDZramStats" title="BDKBDZramStats"><span class="type">BDKBDZramStats</span></a> *data</code></em>);</pre>
<p>Creates a new copy of <em class="parameter"><code>data</code></em>
.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-zram-stats-free"></a><h3>bd_kbd_zram_stats_free ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
bd_kbd_zram_stats_free (<em class="parameter"><code><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDZramStats" title="BDKBDZramStats"><span class="type">BDKBDZramStats</span></a> *data</code></em>);</pre>
<p>Frees <em class="parameter"><code>data</code></em>
.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
</div>
<hr>
<div class="refsect2">
<a name="bd-kbd-is-tech-avail"></a><h3>bd_kbd_is_tech_avail ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
bd_kbd_is_tech_avail (<em class="parameter"><code><a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDTech" title="enum BDKBDTech"><span class="type">BDKBDTech</span></a> tech</code></em>,
                      <em class="parameter"><code><span class="type">guint64</span> mode</code></em>,
                      <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<div class="refsect3">
<a name="bd-kbd-is-tech-avail.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>tech</p></td>
<td class="parameter_description"><p>the queried tech</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mode</p></td>
<td class="parameter_description"><p>a bit mask of queried modes of operation (<a class="link" href="libblockdev-KernelBlockDevices.html#BDKBDTechMode" title="enum BDKBDTechMode"><span class="type">BDKBDTechMode</span></a>) for <em class="parameter"><code>tech</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>place to store error (details about why the <em class="parameter"><code>tech</code></em>
-<em class="parameter"><code>mode</code></em>
combination is not available). </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="bd-kbd-is-tech-avail.returns"></a><h4>Returns</h4>
<p> whether the <em class="parameter"><code>tech</code></em>
-<em class="parameter"><code>mode</code></em>
combination is available -- supported by the
plugin implementation and having all the runtime dependencies available</p>
</div>
</div>
</div>
<div class="refsect1">
<a name="libblockdev-KernelBlockDevices.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="BDKBDBcacheMode"></a><h3>enum BDKBDBcacheMode</h3>
<div class="refsect3">
<a name="BDKBDBcacheMode.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-MODE-WRITETHROUGH:CAPS"></a>BD_KBD_MODE_WRITETHROUGH</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-MODE-WRITEBACK:CAPS"></a>BD_KBD_MODE_WRITEBACK</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-MODE-WRITEAROUND:CAPS"></a>BD_KBD_MODE_WRITEAROUND</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-MODE-NONE:CAPS"></a>BD_KBD_MODE_NONE</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-MODE-UNKNOWN:CAPS"></a>BD_KBD_MODE_UNKNOWN</p></td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="BDKBDBcacheStats"></a><h3>BDKBDBcacheStats</h3>
<pre class="programlisting">typedef struct {
    gchar *state;
    guint64 block_size;
    guint64 cache_size;
    guint64 cache_used;
    guint64 hits;
    guint64 misses;
    guint64 bypass_hits;
    guint64 bypass_misses;
} BDKBDBcacheStats;
</pre>
<div class="refsect3">
<a name="BDKBDBcacheStats.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><span class="type">gchar</span> *<em class="structfield"><code><a name="BDKBDBcacheStats.state"></a>state</code></em>;</p></td>
<td class="struct_member_description"><p>state of the cache</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">guint64</span> <em class="structfield"><code><a name="BDKBDBcacheStats.block-size"></a>block_size</code></em>;</p></td>
<td class="struct_member_description"><p>block size used by the cache</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">guint64</span> <em class="structfield"><code><a name="BDKBDBcacheStats.cache-size"></a>cache_size</code></em>;</p></td>
<td class="struct_member_description"><p>size of the cache</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">guint64</span> <em class="structfield"><code><a name="BDKBDBcacheStats.cache-used"></a>cache_used</code></em>;</p></td>
<td class="struct_member_description"><p>size of the used space in the cache</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">guint64</span> <em class="structfield"><code><a name="BDKBDBcacheStats.hits"></a>hits</code></em>;</p></td>
<td class="struct_member_description"><p>number of hits</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">guint64</span> <em class="structfield"><code><a name="BDKBDBcacheStats.misses"></a>misses</code></em>;</p></td>
<td class="struct_member_description"><p>number of misses</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">guint64</span> <em class="structfield"><code><a name="BDKBDBcacheStats.bypass-hits"></a>bypass_hits</code></em>;</p></td>
<td class="struct_member_description"><p>number of bypass hits</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">guint64</span> <em class="structfield"><code><a name="BDKBDBcacheStats.bypass-misses"></a>bypass_misses</code></em>;</p></td>
<td class="struct_member_description"><p>number of bypass misses</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="BDKBDError"></a><h3>enum BDKBDError</h3>
<div class="refsect3">
<a name="BDKBDError.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-ERROR-INVAL:CAPS"></a>BD_KBD_ERROR_INVAL</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-ERROR-ZRAM-NOEXIST:CAPS"></a>BD_KBD_ERROR_ZRAM_NOEXIST</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-ERROR-ZRAM-INVAL:CAPS"></a>BD_KBD_ERROR_ZRAM_INVAL</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-ERROR-BCACHE-PARSE:CAPS"></a>BD_KBD_ERROR_BCACHE_PARSE</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-ERROR-BCACHE-SETUP-FAIL:CAPS"></a>BD_KBD_ERROR_BCACHE_SETUP_FAIL</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-ERROR-BCACHE-DETACH-FAIL:CAPS"></a>BD_KBD_ERROR_BCACHE_DETACH_FAIL</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-ERROR-BCACHE-NOT-ATTACHED:CAPS"></a>BD_KBD_ERROR_BCACHE_NOT_ATTACHED</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-ERROR-BCACHE-UUID:CAPS"></a>BD_KBD_ERROR_BCACHE_UUID</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-ERROR-BCACHE-MODE-FAIL:CAPS"></a>BD_KBD_ERROR_BCACHE_MODE_FAIL</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-ERROR-BCACHE-MODE-INVAL:CAPS"></a>BD_KBD_ERROR_BCACHE_MODE_INVAL</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-ERROR-BCACHE-NOEXIST:CAPS"></a>BD_KBD_ERROR_BCACHE_NOEXIST</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-ERROR-BCACHE-INVAL:CAPS"></a>BD_KBD_ERROR_BCACHE_INVAL</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-ERROR-TECH-UNAVAIL:CAPS"></a>BD_KBD_ERROR_TECH_UNAVAIL</p></td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="BDKBDZramStats"></a><h3>BDKBDZramStats</h3>
<pre class="programlisting">typedef struct {
    guint64 disksize;
    guint64 num_reads;
    guint64 num_writes;
    guint64 invalid_io;
    guint64 zero_pages;
    guint64 max_comp_streams;
    gchar* comp_algorithm;
    guint64 orig_data_size;
    guint64 compr_data_size;
    guint64 mem_used_total;
} BDKBDZramStats;
</pre>
<p>see zRAM kernel documentation for details
(https://www.kernel.org/doc/Documentation/blockdev/zram.txt)</p>
</div>
<hr>
<div class="refsect2">
<a name="BD-KBD-ERROR:CAPS"></a><h3>BD_KBD_ERROR</h3>
<pre class="programlisting">#define             BD_KBD_ERROR</pre>
</div>
<hr>
<div class="refsect2">
<a name="BDKBDTech"></a><h3>enum BDKBDTech</h3>
<div class="refsect3">
<a name="BDKBDTech.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-TECH-ZRAM:CAPS"></a>BD_KBD_TECH_ZRAM</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-TECH-BCACHE:CAPS"></a>BD_KBD_TECH_BCACHE</p></td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="BDKBDTechMode"></a><h3>enum BDKBDTechMode</h3>
<div class="refsect3">
<a name="BDKBDTechMode.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-TECH-MODE-CREATE:CAPS"></a>BD_KBD_TECH_MODE_CREATE</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-TECH-MODE-DESTROY:CAPS"></a>BD_KBD_TECH_MODE_DESTROY</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-TECH-MODE-MODIFY:CAPS"></a>BD_KBD_TECH_MODE_MODIFY</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="BD-KBD-TECH-MODE-QUERY:CAPS"></a>BD_KBD_TECH_MODE_QUERY</p></td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
</div>
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