autofs-5.1.7 - set offset parent in update_offset_entry()

From: Ian Kent <raven@themaw.net>

Avoid the list traversal in cache_set_parents() by setting the
offset parent when updating the offset.

Signed-off-by: Ian Kent <raven@themaw.net>
---
 CHANGELOG           |    1 +
 include/automount.h |    2 +-
 lib/cache.c         |   26 +++++++++++---------------
 modules/parse_sun.c |    5 ++++-
 4 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/CHANGELOG b/CHANGELOG
index ee746277..c4ebb52f 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -8,6 +8,7 @@
 - eliminate cache_lookup_offset() usage.
 - fix is mounted check on non existent path.
 - simplify cache_get_parent().
+- set offset parent in update_offset_entry().
 
 25/01/2021 autofs-5.1.7
 - make bind mounts propagation slave by default.
diff --git a/include/automount.h b/include/automount.h
index 2f09e8e7..730be19a 100644
--- a/include/automount.h
+++ b/include/automount.h
@@ -208,7 +208,7 @@ int cache_add(struct mapent_cache *mc, struct map_source *ms, const char *key, c
 int cache_update_offset(struct mapent_cache *mc, const char *mkey, const char *key, const char *mapent, time_t age);
 int cache_lookup_negative(struct mapent *me, const char *key);
 void cache_update_negative(struct mapent_cache *mc, struct map_source *ms, const char *key, time_t timeout);
-int cache_set_parents(struct mapent *mm);
+int cache_set_offset_parent(struct mapent_cache *mc, const char *offset);
 int cache_update(struct mapent_cache *mc, struct map_source *ms, const char *key, const char *mapent, time_t age);
 int cache_delete(struct mapent_cache *mc, const char *key);
 int cache_delete_offset(struct mapent_cache *mc, const char *key);
diff --git a/lib/cache.c b/lib/cache.c
index 53f290cd..ce9e9bd2 100644
--- a/lib/cache.c
+++ b/lib/cache.c
@@ -864,25 +864,21 @@ static struct mapent *get_offset_parent(struct mapent_cache *mc,
 	return NULL;
 }
 
-int cache_set_parents(struct mapent *mm)
+int cache_set_offset_parent(struct mapent_cache *mc, const char *offset)
 {
-	struct list_head *multi_head, *p;
-	struct mapent *this;
+	struct mapent *this, *parent;
 
-	if (!mm->multi)
+	this = cache_lookup_distinct(mc, offset);
+	if (!this)
+		return 0;
+	if (!this->multi)
 		return 0;
 
-	multi_head = &mm->multi->multi_list;
-
-	list_for_each(p, multi_head) {
-		struct mapent *parent;
-		this = list_entry(p, struct mapent, multi_list);
-		parent = get_offset_parent(mm->mc, this->key);
-		if (parent)
-			this->parent = parent;
-		else
-			this->parent = mm->multi;
-	}
+	parent = get_offset_parent(mc, offset);
+	if (parent)
+		this->parent = parent;
+	else
+		this->parent = this->multi;
 
 	return 1;
 }
diff --git a/modules/parse_sun.c b/modules/parse_sun.c
index 819d6adc..f42af7b7 100644
--- a/modules/parse_sun.c
+++ b/modules/parse_sun.c
@@ -859,6 +859,10 @@ update_offset_entry(struct autofs_point *ap, const char *name,
 	}
 
 	ret = cache_update_offset(mc, name, m_key, m_mapent, age);
+
+	if (!cache_set_offset_parent(mc, m_key))
+		error(ap->logopt, "failed to set offset parent");
+
 	if (ret == CHE_DUPLICATE) {
 		warn(ap->logopt, MODPREFIX
 		     "syntax error or duplicate offset %s -> %s", path, loc);
@@ -1613,7 +1617,6 @@ dont_expand:
 		 */
 		if (me == me->multi)
 			clean_stale_multi_triggers(ap, me, NULL, NULL);
-		cache_set_parents(me);
 
 		rv = mount_subtree(ap, me, name, NULL, options, ctxt);