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<div dir="auto" class="title is-1 has-text-weight-bold">🗄️ Mounting BTRFS subvolumes</div>
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<span>Monday 27 February 2023</span>
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<p dir="auto">If you have installed GNU/Linux with BTRFS as the filesystem, chances are that your OS installer has used <strong>sub-volumes</strong> for the <code>root</code>, <code>home</code> and other mount points. 🗄️</p>
<p dir="auto">You can verify this by mounting the actual root filesystem device and listing its contents:</p>
<pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;"><code><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span><span style="color:#6272a4"># ls -l /mnt/</span>
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2</span><span>total <span style="color:#bd93f9">0</span>
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">3</span><span>drwxr-xr-x <span style="color:#bd93f9">1</span> root root <span style="color:#bd93f9">204</span> Feb <span style="color:#bd93f9">22</span> 13:28 @
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">4</span><span>drwxr-xr-x <span style="color:#bd93f9">1</span> root root <span style="color:#bd93f9">180</span> Feb <span style="color:#bd93f9">22</span> 14:29 @cache
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">5</span><span>drwxr-xr-x <span style="color:#bd93f9">1</span> root root <span style="color:#bd93f9">10</span> Dec <span style="color:#bd93f9">2</span> 10:52 @home
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">6</span><span>drwxr-xr-x <span style="color:#bd93f9">1</span> root root <span style="color:#bd93f9">482</span> Feb <span style="color:#bd93f9">26</span> 00:00 @log
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">7</span><span>drwxr-x--- <span style="color:#bd93f9">1</span> root root <span style="color:#bd93f9">350</span> Feb <span style="color:#bd93f9">23</span> 15:40 @root
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">8</span><span>drwxr-xr-x <span style="color:#bd93f9">1</span> root root <span style="color:#bd93f9">14</span> Oct <span style="color:#bd93f9">19</span> 07:42 @srv
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">9</span><span>drwxrwxrwt <span style="color:#bd93f9">1</span> root root <span style="color:#bd93f9">1576</span> Feb <span style="color:#bd93f9">27</span> 17:18 @tmp
</span></span></code></pre><p dir="auto">Here <code>@</code>, <code>@home</code>, <code>@log</code> etc. are the BTRFS sub-volumes. <code>@</code> is the OS root sub-volume. You can mount by giving the <code>-osubvol=@</code> option to the mount command:</p>
<pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;"><code><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 1</span><span><span style="color:#6272a4"># mount -osubvol=@ /dev/dm-0 /mnt/</span>
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 2</span><span><span style="color:#6272a4"># ls -l /mnt/</span>
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 3</span><span>total <span style="color:#bd93f9">24</span>
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 4</span><span>lrwxrwxrwx <span style="color:#bd93f9">1</span> root root <span style="color:#bd93f9">7</span> Feb <span style="color:#bd93f9">1</span> 02:21 bin -> usr/bin
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 5</span><span>drwxr-xr-x <span style="color:#bd93f9">1</span> root root <span style="color:#bd93f9">208</span> Feb <span style="color:#bd93f9">22</span> 13:30 boot
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 6</span><span>drwxr-xr-x <span style="color:#bd93f9">1</span> root root <span style="color:#bd93f9">8</span> Oct <span style="color:#bd93f9">20</span> 18:39 dev
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 7</span><span>drwxr-xr-x <span style="color:#bd93f9">1</span> root root <span style="color:#bd93f9">5018</span> Feb <span style="color:#bd93f9">25</span> 10:56 etc
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 8</span><span>drwxr-xr-x <span style="color:#bd93f9">1</span> root root <span style="color:#bd93f9">0</span> Dec <span style="color:#bd93f9">2</span> 10:48 home
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 9</span><span>lrwxrwxrwx <span style="color:#bd93f9">1</span> root root <span style="color:#bd93f9">7</span> Feb <span style="color:#bd93f9">1</span> 02:21 lib -> usr/lib
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">10</span><span>lrwxrwxrwx <span style="color:#bd93f9">1</span> root root <span style="color:#bd93f9">7</span> Feb <span style="color:#bd93f9">1</span> 02:21 lib64 -> usr/lib
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">11</span><span>drwxr-xr-x <span style="color:#bd93f9">1</span> root root <span style="color:#bd93f9">22</span> Dec <span style="color:#bd93f9">16</span> 13:00 mnt
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">12</span><span>drwxr-xr-x <span style="color:#bd93f9">1</span> root root <span style="color:#bd93f9">214</span> Feb <span style="color:#bd93f9">23</span> 15:50 opt
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">13</span><span>drwxr-xr-x <span style="color:#bd93f9">1</span> root root <span style="color:#bd93f9">0</span> Dec <span style="color:#bd93f9">2</span> 10:48 proc
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">14</span><span>drwxr-xr-x <span style="color:#bd93f9">1</span> root root <span style="color:#bd93f9">66</span> Oct <span style="color:#bd93f9">20</span> 18:47 root
</span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">15</span><span> .... .... ....
</span></span></code></pre><p dir="auto"><a href="/+/tag/linux" class="tag is-info is-light">#linux</a> <a href="/+/tag/btrfs" class="tag is-info is-light">#btrfs</a> <a href="/+/tag/systemrescue" class="tag is-info is-light">#systemrescue</a> <a href="/+/tag/filesystem" class="tag is-info is-light">#filesystem</a></p>
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