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A Wikiful of Hacks: Hacks.Wiki is an experiment to organise quick hacks, notes, bookmarks and tools into an easy-to-build-and-maintain “Digital Garden”.
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hacks-wiki/Mounting BTRFS subvolumes/index.html

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  1. <!DOCTYPE html>
  2. <html lang="en">
  3.   <head>
  4.     <meta name="viewport" content="width=device-width, initial-scale=1">
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  6.     <link rel="icon" href="/public/logo.png">
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  8.     <title>🗄️ Mounting BTRFS subvolumes | Hacks.Wiki - Today I Learned...</title>
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  10.     <meta property="og:site_name" content="Hacks.Wiki - Today I Learned..." />
  11.     <meta property="og:title" content="Mounting BTRFS subvolumes" />
  12.     <meta property="og:description" content="If you have installed GNU/Linux with BTRFS as the filesystem, chances are that your OS installer has used sub-volumes for the root , home and other mount points. You can verify this by mounting the a" />
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  17.     <meta name="twitter:title" content="Mounting BTRFS subvolumes" />
  18.     <meta name="twitter:description" content="If you have installed GNU/Linux with BTRFS as the filesystem, chances are that your OS installer has used sub-volumes for the root , home and other mount points. You can verify this by mounting the a" />
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  51. <div dir="auto" class="title is-1 has-text-weight-bold">🗄️ Mounting BTRFS subvolumes</div>
  52. 

  53.       <div class="content">
  54.         
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  56. <div class="columns subtitle is-size-7">
  57. 

  58.   
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  62.       <span class="icon"> <i class="fa-solid fa-clock"></i> </span>
  63.       <span>Monday 27 February 2023</span>
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  65.       <span class="icon"> <i class="fa-solid fa-code-branch"></i> </span>
  66.       <span>2 versions</span>
  67.       
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  76. <div class="view">
  77.   
  78.   <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. &#x1f5c4;&#xfe0f;</p>
  79. <p dir="auto">You can verify this by mounting the actual root filesystem device and listing its contents:</p>
  80. <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>
  81. </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>
  82. </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 @
  83. </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
  84. </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
  85. </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
  86. </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
  87. </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
  88. </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
  89. </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>
  90. <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>
  91. </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>
  92. </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>
  93. </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 -&gt; usr/bin
  94. </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
  95. </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
  96. </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
  97. </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
  98. </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 -&gt; usr/lib
  99. </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 -&gt; usr/lib
  100. </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
  101. </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
  102. </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
  103. </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
  104. </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>    ....    ....    ....
  105. </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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  123.     <a href="/Chromebox-Audio" dir="auto">🎧 Chromebox-Audio</a> <time class="has-text-grey is-size-7">Monday 27 February 2023</time>
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