Show file system inode usage and read-only status

bin/malpd

@@ -3,6 +3,7 @@
 require "socket"
 require "fileutils"
 require "json"
+require "shellwords"
 
 SOCKET_PATH = "/run/malpd/malpd.sock"
 
@@ -63,8 +64,16 @@ def read_smart(name)
   result
 end
 
+def read_inodes(mount)
+  out = `stat -f -c '%c %d' #{Shellwords.escape(mount)} 2>/dev/null`.strip
+  return nil if out.empty?
+  total, free = out.split.map(&:to_i)
+  return nil unless total && total > 0
+  [total, total - free]
+end
+
 def read_filesystems
-  out = `findmnt -J -b -o SOURCE,TARGET,FSTYPE,SIZE,USED 2>/dev/null`
+  out = `findmnt -J -b -o SOURCE,TARGET,FSTYPE,SIZE,USED,OPTIONS 2>/dev/null`
   return [] if out.empty?
   data = JSON.parse(out) rescue nil
   return [] unless data
@@ -86,14 +95,22 @@ def read_filesystems
     key = [source, target]
     next if seen[key]
     seen[key] = true
-    result << {
+
+    opts = node["options"].to_s.split(",")
+    entry = {
       "type"     => "filesystem",
       "source"   => source,
       "mount"    => target,
       "fstype"   => fstype,
       "size"     => size,
-      "used"   => node["used"].to_i
+      "used"     => node["used"].to_i,
+      "readonly" => opts.include?("ro")
     }
+    if (ino = read_inodes(target))
+      entry["inode_total"] = ino[0]
+      entry["inode_used"]  = ino[1]
+    end
+    result << entry
   end
   result
 end

cgi-bin/malp.rb

@@ -210,21 +210,42 @@ if cgi.params.key?("content")
         used_b = entry["used"].to_i
         pct_f  = size_b > 0 ? (used_b * 100.0 / size_b) : 0.0
         pct    = pct_f.round
-        cls    = pct_f >= 90 ? "bad" : pct_f >= 75 ? "warn" : "ok"
+        space_cls = pct_f >= 90 ? "bad" : pct_f >= 75 ? "warn" : "ok"
         used_h = CGI.escapeHTML(human_capacity(used_b))
         size_h = CGI.escapeHTML(human_capacity(size_b))
 
+        fs_stats = []
+        inode_cls = "ok"
+        if (itot = entry["inode_total"].to_i) > 0
+          iused = entry["inode_used"].to_i
+          ipct_f = iused * 100.0 / itot
+          inode_cls = ipct_f >= 90 ? "bad" : ipct_f >= 75 ? "warn" : "ok"
+          fs_stats << [inode_cls, "Inodes #{ipct_f.round}%"]
+        end
+        fs_stats << ["warn", "READ-ONLY"] if entry["readonly"]
+
+        severities = [space_cls, inode_cls]
+        card_cls = severities.include?("bad")  ? "bad"  :
+                   severities.include?("warn") ? "warn" : "ok"
+
+        stats_html = fs_stats.map { |c, txt|
+          %(<span class="stat #{c}">#{CGI.escapeHTML(txt)}</span>)
+        }.join
+        stats_block = fs_stats.empty? ? "" :
+          %(<div class="drive-stats" style="margin-top:0.6rem;">#{stats_html}</div>)
+
         html << <<~HTML
-          <div class="card #{cls}">
+          <div class="card #{card_cls}">
             <div class="card-header">
               <span class="card-title">#{mount} <span class="card-capacity">#{fstype}</span></span>
-              <span class="badge #{cls}">#{pct}%</span>
+              <span class="badge #{space_cls}">#{pct}%</span>
             </div>
             <div style="display:flex;justify-content:space-between;align-items:center;margin-top:0.5rem;margin-bottom:0.3rem;">
               <span style="font-size:0.72rem;color:#64748b;font-weight:600;">#{source}</span>
-              <span class="subitem-value #{cls}">#{used_h} / #{size_h}</span>
+              <span class="subitem-value #{space_cls}">#{used_h} / #{size_h}</span>
             </div>
-            <div class="bar-track" style="height:6px;"><div class="bar-fill #{cls}" style="width:#{pct}%"></div></div>
+            <div class="bar-track" style="height:6px;"><div class="bar-fill #{space_cls}" style="width:#{pct}%"></div></div>
+            #{stats_block}
           </div>
         HTML
       end