diff --git a/src/fs/btrfs.cpp b/src/fs/btrfs.cpp
--- a/src/fs/btrfs.cpp
+++ b/src/fs/btrfs.cpp
@@ -17,12 +17,14 @@
  *************************************************************************/
 
 #include "fs/btrfs.h"
+#include "fs/filesystem.h"
 
 #include "util/externalcommand.h"
 #include "util/capacity.h"
 #include "util/report.h"
 
 #include <QRegularExpression>
+#include <QStorageInfo>
 #include <QString>
 #include <QTemporaryDir>
 
@@ -166,11 +168,13 @@
 
 bool btrfs::resizeOnline(Report& report, const QString& deviceNode, const QString& mountPoint, qint64 length) const
 {
-    ExternalCommand resizeCmd(report, QStringLiteral("btrfs"),
-                              { QStringLiteral("filesystem"), QStringLiteral("resize"), QString::number(length), mountPoint });
+    if (!FileSystem::isReadOnly()) {
+        ExternalCommand resizeCmd(report, QStringLiteral("btrfs"),
+                                { QStringLiteral("filesystem"), QStringLiteral("resize"), QString::number(length), mountPoint });
 
-    if (resizeCmd.run(-1) && resizeCmd.exitCode() == 0)
-        return true;
+        if (resizeCmd.run(-1) && resizeCmd.exitCode() == 0)
+            return true;
+    }
 
     report.line() << xi18nc("@info:progress", "Resizing Btrfs file system on partition <filename>%1</filename> failed: btrfs file system resize failed.", deviceNode);
     return false;
diff --git a/src/fs/filesystem.h b/src/fs/filesystem.h
--- a/src/fs/filesystem.h
+++ b/src/fs/filesystem.h
@@ -235,6 +235,9 @@
     virtual bool mount(Report& report, const QString& deviceNode, const QString& mountPoint);
     virtual bool unmount(Report& report, const QString& deviceNode);
 
+    /**< @return true if the mount point where FileSystem is mounted is read only */
+    bool isReadOnly() const;
+    
     /**< @return the FileSystem's first sector */
     qint64 firstSector() const;
 
@@ -282,7 +285,7 @@
 
     /**< @param s the new UUID */
     void setUUID(const QString& s);
-
+    
 protected:
     static bool findExternal(const QString& cmdName, const QStringList& args = QStringList(), int exptectedCode = 1);
 
diff --git a/src/fs/filesystem.cpp b/src/fs/filesystem.cpp
--- a/src/fs/filesystem.cpp
+++ b/src/fs/filesystem.cpp
@@ -555,6 +555,19 @@
     return false;
 }
 
+bool FileSystem::isReadOnly() const
+{
+    for (const QStorageInfo& volume : QStorageInfo::mountedVolumes()) {
+        if (!volume.isValid() || !volume.isReady()) {
+            return false;
+        } else {
+            return volume.isReadOnly();
+        }
+    }
+    
+    return true;
+}
+
 qint64 FileSystem::firstSector() const
 {
     return d->m_FirstSector;