Correct units for "-dbcache" and "-prune"

All dbcache-related values in the code are measured in MiB (not in
megabytes, MB) or in bytes.
The GUI "-prune" values in GB are translated to the node values in MiB
correctly. The maximum of the "-prune" QSpinBox is not limited by the
default value of 99 (GB).
Also, this improves log readability.

5 files changed, 15 insertions, 10 deletions

diff --git a/src/qt/forms/optionsdialog.ui b/src/qt/forms/optionsdialog.ui
index 507d195b72..240a7a7e92 100644
--- a/src/qt/forms/optionsdialog.ui
+++ b/src/qt/forms/optionsdialog.ui
@@ -121,7 +121,7 @@
          <item>
           <widget class="QLabel" name="databaseCacheUnitLabel">
            <property name="text">
-            <string>MB</string>
+            <string>MiB</string>
            </property>
            <property name="textFormat">
             <enum>Qt::PlainText</enum>
diff --git a/src/qt/guiconstants.h b/src/qt/guiconstants.h
index 4d6006c582..736ff13a4a 100644
--- a/src/qt/guiconstants.h
+++ b/src/qt/guiconstants.h
@@ -52,4 +52,7 @@ static const int MAX_URI_LENGTH = 255;
 #define QAPP_APP_NAME_TESTNET "Bitcoin-Qt-testnet"
 #define QAPP_APP_NAME_REGTEST "Bitcoin-Qt-regtest"
 
+/* One gigabyte (GB) in bytes */
+static constexpr uint64_t GB_BYTES{1000000000};
+
 #endif // BITCOIN_QT_GUICONSTANTS_H
diff --git a/src/qt/intro.cpp b/src/qt/intro.cpp
index a9a6ab9a8e..5f853c20b6 100644
--- a/src/qt/intro.cpp
+++ b/src/qt/intro.cpp
@@ -10,6 +10,7 @@
 #include <qt/intro.h>
 #include <qt/forms/ui_intro.h>
 
+#include <qt/guiconstants.h>
 #include <qt/guiutil.h>
 
 #include <interfaces/node.h>
@@ -21,7 +22,6 @@
 
 #include <cmath>
 
-static const uint64_t GB_BYTES = 1000000000LL;
 /* Total required space (in GB) depending on user choice (prune, not prune) */
 static uint64_t requiredSpace;
 
diff --git a/src/qt/optionsdialog.cpp b/src/qt/optionsdialog.cpp
index c9871f6c66..789b51cd6f 100644
--- a/src/qt/optionsdialog.cpp
+++ b/src/qt/optionsdialog.cpp
@@ -10,6 +10,7 @@
 #include <qt/forms/ui_optionsdialog.h>
 
 #include <qt/bitcoinunits.h>
+#include <qt/guiconstants.h>
 #include <qt/guiutil.h>
 #include <qt/optionsmodel.h>
 
@@ -37,10 +38,6 @@ OptionsDialog::OptionsDialog(QWidget *parent, bool enableWallet) :
     /* Main elements init */
     ui->databaseCache->setMinimum(nMinDbCache);
     ui->databaseCache->setMaximum(nMaxDbCache);
-    static const uint64_t GiB = 1024 * 1024 * 1024;
-    static const uint64_t nMinDiskSpace = MIN_DISK_SPACE_FOR_BLOCK_FILES / GiB +
-                          (MIN_DISK_SPACE_FOR_BLOCK_FILES % GiB) ? 1 : 0;
-    ui->pruneSize->setMinimum(nMinDiskSpace);
     ui->threadsScriptVerif->setMinimum(-GetNumCores());
     ui->threadsScriptVerif->setMaximum(MAX_SCRIPTCHECK_THREADS);
     ui->pruneWarning->setVisible(false);
@@ -161,6 +158,10 @@ void OptionsDialog::setModel(OptionsModel *_model)
         mapper->toFirst();
 
         updateDefaultProxyNets();
+
+        // Prune values are in GB to be consistent with intro.cpp
+        static constexpr uint64_t nMinDiskSpace = (MIN_DISK_SPACE_FOR_BLOCK_FILES / GB_BYTES) + (MIN_DISK_SPACE_FOR_BLOCK_FILES % GB_BYTES) ? 1 : 0;
+        ui->pruneSize->setRange(nMinDiskSpace, _model->node().getAssumedBlockchainSize());
     }
 
     /* warn when one of the following settings changes by user action (placed here so init via mapper doesn't trigger them) */
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
index d04a2cf862..62496a57f4 100644
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -9,6 +9,7 @@
 #include <qt/optionsmodel.h>
 
 #include <qt/bitcoinunits.h>
+#include <qt/guiconstants.h>
 #include <qt/guiutil.h>
 
 #include <interfaces/node.h>
@@ -92,10 +93,10 @@ void OptionsModel::Init(bool resetSettings)
         settings.setValue("bPrune", false);
     if (!settings.contains("nPruneSize"))
         settings.setValue("nPruneSize", 2);
-    // Convert prune size to MB:
-    const uint64_t nPruneSizeMB = settings.value("nPruneSize").toInt() * 1000;
-    if (!m_node.softSetArg("-prune", settings.value("bPrune").toBool() ? std::to_string(nPruneSizeMB) : "0")) {
-      addOverriddenOption("-prune");
+    // Convert prune size from GB to MiB:
+    const uint64_t nPruneSizeMiB = (settings.value("nPruneSize").toInt() * GB_BYTES) >> 20;
+    if (!m_node.softSetArg("-prune", settings.value("bPrune").toBool() ? std::to_string(nPruneSizeMiB) : "0")) {
+        addOverriddenOption("-prune");
     }
 
     if (!settings.contains("nDatabaseCache"))