[glib] gunixmounts: Speed up mtab processing with libmount

[Ondrej Holy <oholy src gnome org>]

commit 53ed1804e255c78dd4938fe53d27edf90844bdf1
Author: Ondrej Holy <oholy redhat com>
Date:   Fri May 5 12:33:58 2017 +0200

    gunixmounts: Speed up mtab processing with libmount
    
    libmnt_context is useless. It contains cache which is useful for searching,
    but it isn't used in our case. Let's use mnt_context_parse_mtab instead
    directly and the mtab processing will be faster.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=781867

 gio/gunixmounts.c |   16 ++++++----------
 1 files changed, 6 insertions(+), 10 deletions(-)
---
diff --git a/gio/gunixmounts.c b/gio/gunixmounts.c
index c7effd6..d20d144 100644
--- a/gio/gunixmounts.c
+++ b/gio/gunixmounts.c
@@ -391,15 +391,13 @@ static GList *
 _g_get_unix_mounts (void)
 {
   struct libmnt_table *table = NULL;
-  struct libmnt_context *ctxt = NULL;
   struct libmnt_iter* iter = NULL;
   struct libmnt_fs *fs = NULL;
   GUnixMountEntry *mount_entry = NULL;
   GList *return_list = NULL;
 
-  ctxt = mnt_new_context ();
-  mnt_context_get_mtab (ctxt, &table);
-  if (!table)
+  table = mnt_new_table ();
+  if (mnt_table_parse_mtab (table, NULL) < 0)
     goto out;
 
   iter = mnt_new_iter (MNT_ITER_FORWARD);
@@ -435,7 +433,7 @@ _g_get_unix_mounts (void)
   mnt_free_iter (iter);
 
  out:
-  mnt_free_context (ctxt);
+  mnt_unref_table (table);
 
   return g_list_reverse (return_list);
 }
@@ -875,15 +873,13 @@ static GList *
 _g_get_unix_mount_points (void)
 {
   struct libmnt_table *table = NULL;
-  struct libmnt_context *ctxt = NULL;
   struct libmnt_iter* iter = NULL;
   struct libmnt_fs *fs = NULL;
   GUnixMountPoint *mount_point = NULL;
   GList *return_list = NULL;
 
-  ctxt = mnt_new_context ();
-  mnt_context_get_fstab (ctxt, &table);
-  if (!table)
+  table = mnt_new_table ();
+  if (mnt_table_parse_mtab (table, NULL) < 0)
     goto out;
 
   iter = mnt_new_iter (MNT_ITER_FORWARD);
@@ -953,7 +949,7 @@ _g_get_unix_mount_points (void)
   mnt_free_iter (iter);
 
  out:
-  mnt_free_context (ctxt);
+  mnt_unref_table (table);
 
   return g_list_reverse (return_list);
 }