autofs-5.0.6 - add function to delete offset cache entry

From: Ian Kent <ikent@redhat.com>

Currently only the entire expanded list of offset cache entries may be
removed from the cache. In order to be able to update already expanded
multi map offset entries we need to be able to delete them.
---

 include/automount.h |    1 +
 lib/cache.c         |   47 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+), 0 deletions(-)


diff --git a/include/automount.h b/include/automount.h
index e1246e3..40c1975 100644
--- a/include/automount.h
+++ b/include/automount.h
@@ -192,6 +192,7 @@ int cache_add_offset(struct mapent_cache *mc, const char *mkey, const char *key,
 int cache_set_parents(struct mapent *mm);
 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);
 void cache_multi_readlock(struct mapent *me);
 void cache_multi_writelock(struct mapent *me);
 void cache_multi_unlock(struct mapent *me);
diff --git a/lib/cache.c b/lib/cache.c
index 3464e7d..1489273 100644
--- a/lib/cache.c
+++ b/lib/cache.c
@@ -771,6 +771,53 @@ int cache_update(struct mapent_cache *mc, struct map_source *ms, const char *key
 	return ret;
 }
 
+/* cache_multi_lock of the multi mount owner must be held by caller */
+int cache_delete_offset(struct mapent_cache *mc, const char *key)
+{
+	u_int32_t hashval = hash(key, mc->size);
+	struct mapent *me = NULL, *pred;
+	int status;
+
+	me = mc->hash[hashval];
+	if (!me)
+		return CHE_FAIL;
+
+	if (strcmp(key, me->key) == 0) {
+		if (me->multi && me->multi == me)
+			return CHE_FAIL;
+		mc->hash[hashval] = me->next;
+		goto delete;
+	}
+
+	while (me->next != NULL) {
+		pred = me;
+		me = me->next;
+		if (strcmp(key, me->key) == 0) {
+			if (me->multi && me->multi == me)
+				return CHE_FAIL;
+			pred->next = me->next;
+			goto delete;
+		}
+	}
+
+	return CHE_FAIL;
+
+delete:
+	status = pthread_rwlock_destroy(&me->multi_rwlock);
+	if (status)
+		fatal(status);
+	list_del(&me->multi_list);
+	ino_index_lock(mc);
+	list_del(&me->ino_index);
+	ino_index_unlock(mc);
+	free(me->key);
+	if (me->mapent)
+		free(me->mapent);
+	free(me);
+
+	return CHE_OK;
+}
+
 /* cache must be write locked by caller */
 int cache_delete(struct mapent_cache *mc, const char *key)
 {