[tracker-miners/wip/halfline/fanotify-fallback-fix] libtracker-miner: Properly detect fanotify failures

[Ray Strode <halfline src gnome org>]

commit 94a189ee9b086c2f0105cfd80c6a61588f7ffe87
Author: Ray Strode <rstrode redhat com>
Date:   Mon May 2 15:05:50 2022 -0400

    libtracker-miner: Properly detect fanotify failures
    
    commit 28142bdb5e3b96e0e7328322f3a880d97a6cdca0 makes
    trackers file monitoring code fall back to GLib file monitors,
    if fanotify doesn't work.
    
    Unfortunately, fanotify_mark failures aren't propagated up,
    so the fall back code doesn't get triggered in some cases.
    
    This commit adds the plumbing to make the fall back code get
    propagated.

 src/libtracker-miner/tracker-monitor-fanotify.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)
---
diff --git a/src/libtracker-miner/tracker-monitor-fanotify.c b/src/libtracker-miner/tracker-monitor-fanotify.c
index 7da262e89..9c6755d4a 100644
--- a/src/libtracker-miner/tracker-monitor-fanotify.c
+++ b/src/libtracker-miner/tracker-monitor-fanotify.c
@@ -107,6 +107,7 @@ enum {
 static GInitableIface *initable_parent_iface = NULL;
 
 static void tracker_monitor_fanotify_initable_iface_init (GInitableIface *iface);
+static void monitored_file_free (MonitoredFile *data);
 
 G_DEFINE_TYPE_WITH_CODE (TrackerMonitorFanotify, tracker_monitor_fanotify,
                          TRACKER_TYPE_MONITOR_GLIB,
@@ -559,7 +560,7 @@ tracker_monitor_fanotify_get_property (GObject      *object,
        }
 }
 
-static void
+static gboolean
 add_mark (TrackerMonitorFanotify *monitor,
           GFile                  *file)
 {
@@ -573,9 +574,11 @@ add_mark (TrackerMonitorFanotify *monitor,
                           AT_FDCWD,
                           path) < 0) {
                g_warning ("Could not add mark for path '%s': %m", path);
+               return FALSE;
        }
 
        g_free (path);
+       return TRUE;
 }
 
 static void
@@ -606,6 +609,7 @@ monitored_file_new (TrackerMonitorFanotify *monitor,
        gchar *path;
        struct statfs buf;
        int mntid;
+       gboolean mark_added = FALSE;
 
        path = g_file_get_path (file);
 
@@ -647,11 +651,16 @@ retry:
        data->file = g_object_ref (file);
        data->monitor = monitor;
        memcpy (&data->handle.fsid, &buf.f_fsid, sizeof(fsid_t));
-       add_mark (monitor, file);
+       mark_added = add_mark (monitor, file);
        g_free (path);
 
        data->handle_bytes = create_bytes_for_handle (&data->handle);
 
+       if (!mark_added) {
+               monitored_file_free (data);
+               data = NULL;
+       }
+
        return data;
 }