[gnome-control-center] info: Fix total disc size for btrfs subvolumes

[Bastien Nocera <hadess src gnome org>]

commit b619f7c96a0c26dd3cb303ca731d4b7adaac8d99
Author: Ondrej Holy <oholy redhat com>
Date:   Fri Feb 24 14:26:44 2017 +0100

    info: Fix total disc size for btrfs subvolumes
    
    Total disc size may be wrong if something like btrfs subvolumes are
    used. Do not count multiple mounts with same device_path, because
    it is probably something like btrfs subvolume. Use only the first one
    in order to count the real size.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=708786

 panels/info/cc-info-overview-panel.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/panels/info/cc-info-overview-panel.c b/panels/info/cc-info-overview-panel.c
index 6f7d15c..45ad548 100644
--- a/panels/info/cc-info-overview-panel.c
+++ b/panels/info/cc-info-overview-panel.c
@@ -556,8 +556,10 @@ get_primary_disc_info (CcInfoOverviewPanel *self)
 {
   GList *points;
   GList *p;
+  GHashTable *hash;
   CcInfoOverviewPanelPrivate *priv = cc_info_overview_panel_get_instance_private (self);
 
+  hash = g_hash_table_new (g_str_hash, g_str_equal);
   points = g_unix_mount_points_get (NULL);
 
   /* If we do not have /etc/fstab around, try /etc/mtab */
@@ -568,21 +570,29 @@ get_primary_disc_info (CcInfoOverviewPanel *self)
     {
       GUnixMountEntry *mount = p->data;
       const char *mount_path;
+      const char *device_path;
 
       mount_path = g_unix_mount_get_mount_path (mount);
+      device_path = g_unix_mount_get_device_path (mount);
 
+      /* Do not count multiple mounts with same device_path, because it is
+       * probably something like btrfs subvolume. Use only the first one in
+       * order to count the real size. */
       if (gsd_should_ignore_unix_mount (mount) ||
           gsd_is_removable_mount (mount) ||
           g_str_has_prefix (mount_path, "/media/") ||
-          g_str_has_prefix (mount_path, g_get_home_dir ()))
+          g_str_has_prefix (mount_path, g_get_home_dir ()) ||
+          g_hash_table_lookup (hash, device_path) != NULL)
         {
           g_unix_mount_free (mount);
           continue;
         }
 
       priv->primary_mounts = g_list_prepend (priv->primary_mounts, mount);
+      g_hash_table_insert (hash, (gpointer) device_path, (gpointer) device_path);
     }
   g_list_free (points);
+  g_hash_table_destroy (hash);
 
   get_primary_disc_info_start (self);
 }