unit: add new dependency type RequiresMountsFor=

RequiresMountsFor= is a shortcut for adding requires and after
dependencies to all mount units neeed for the specified paths.

This solves a couple of issues regarding dep loop cycles for encrypted
swap.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/core/unit.h b/src/core/unit.h
index c2bae0a45c..33920892fd 100644
--- a/src/core/unit.h
+++ b/src/core/unit.h
@@ -153,6 +153,8 @@ struct Unit {
         Set *names;
         Set *dependencies[_UNIT_DEPENDENCY_MAX];
 
+        char **requires_mounts_for;
+
         char *description;
 
         char *fragment_path; /* if loaded from a config file this is the primary path to it */
@@ -186,6 +188,9 @@ struct Unit {
         /* Per type list */
         LIST_FIELDS(Unit, units_by_type);
 
+        /* All units which have requires_mounts_for set */
+        LIST_FIELDS(Unit, has_requires_mounts_for);
+
         /* Load queue */
         LIST_FIELDS(Unit, load_queue);
 
@@ -554,6 +559,9 @@ void unit_ref_unset(UnitRef *ref);
 
 #define UNIT_DEREF(ref) ((ref).unit)
 
+int unit_add_one_mount_link(Unit *u, Mount *m);
+int unit_add_mount_links(Unit *u);
+
 const char *unit_load_state_to_string(UnitLoadState i);
 UnitLoadState unit_load_state_from_string(const char *s);