pid1: fix cleanup of stale implicit deps based on /proc/self/mountinfo

The problem was introduced in a37422045fbb68ad68f734e5dc00e0a5b1759773:
we have a unit which has a fragment, and when we'd update it based on
/proc/self/mountinfo, we'd say that e.g. What=/dev/loop8 has origin-fragment.
This commit changes two things:
- origin-fragment is changed to origin-mountinfo-implicit
- when we stop a unit, mountinfo information is flushed and all deps based
  on it are dropped.

The second step is important, because when we restart the unit, we want to
notice that we have "fresh" mountinfo information. We could keep the old info
around and solve this in a different way, but keeping stale information seems
inelegant.

Fixes #11342.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/core/mount.c b/src/core/mount.c
index d7ecfd008a..6df5d60ee1 100644
--- a/src/core/mount.c
+++ b/src/core/mount.c
@@ -378,7 +378,8 @@ static int mount_add_device_dependencies(Mount *m) {
          * automatically stopped when the device disappears suddenly. */
         dep = mount_is_bound_to_device(m) ? UNIT_BINDS_TO : UNIT_REQUIRES;
 
-        mask = m->from_fragment ? UNIT_DEPENDENCY_FILE : UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT;
+        /* We always use 'what' from /proc/self/mountinfo if mounted */
+        mask = m->from_proc_self_mountinfo ? UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT : UNIT_DEPENDENCY_FILE;
 
         r = unit_add_node_dependency(UNIT(m), p->what, device_wants_mount, dep, mask);
         if (r < 0)
@@ -849,6 +850,9 @@ static void mount_enter_dead(Mount *m, MountResult f) {
         unit_unref_uid_gid(UNIT(m), true);
 
         dynamic_creds_destroy(&m->dynamic_creds);
+
+        /* Any dependencies based on /proc/self/mountinfo are now stale */
+        unit_remove_dependencies(UNIT(m), UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT);
 }
 
 static void mount_enter_mounted(Mount *m, MountResult f) {
@@ -1844,6 +1848,7 @@ static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents,
                         }
 
                         mount->from_proc_self_mountinfo = false;
+                        assert_se(update_parameters_proc_self_mount_info(mount, NULL, NULL, NULL) >= 0);
 
                         switch (mount->state) {