1 files changed, 22 insertions, 4 deletions

diff --git a/include/qemu/qht.h b/include/qemu/qht.h
index c9a11cc29a..758c7ac6c8 100644
--- a/include/qemu/qht.h
+++ b/include/qemu/qht.h
@@ -43,7 +43,8 @@ struct qht_stats {
 };
 
 typedef bool (*qht_lookup_func_t)(const void *obj, const void *userp);
-typedef void (*qht_iter_func_t)(struct qht *ht, void *p, uint32_t h, void *up);
+typedef void (*qht_iter_func_t)(void *p, uint32_t h, void *up);
+typedef bool (*qht_iter_bool_func_t)(void *p, uint32_t h, void *up);
 
 #define QHT_MODE_AUTO_RESIZE 0x1 /* auto-resize when heavily loaded */
 #define QHT_MODE_RAW_MUTEXES 0x2 /* bypass the profiler (QSP) */
@@ -103,7 +104,7 @@ bool qht_insert(struct qht *ht, void *p, uint32_t hash, void **existing);
  * Returns the corresponding pointer when a match is found.
  * Returns NULL otherwise.
  */
-void *qht_lookup_custom(struct qht *ht, const void *userp, uint32_t hash,
+void *qht_lookup_custom(const struct qht *ht, const void *userp, uint32_t hash,
                         qht_lookup_func_t func);
 
 /**
@@ -114,7 +115,7 @@ void *qht_lookup_custom(struct qht *ht, const void *userp, uint32_t hash,
  *
  * Calls qht_lookup_custom() using @ht's default comparison function.
  */
-void *qht_lookup(struct qht *ht, const void *userp, uint32_t hash);
+void *qht_lookup(const struct qht *ht, const void *userp, uint32_t hash);
 
 /**
  * qht_remove - remove a pointer from the hash table
@@ -179,10 +180,27 @@ bool qht_resize(struct qht *ht, size_t n_elems);
  *
  * Each time it is called, user-provided @func is passed a pointer-hash pair,
  * plus @userp.
+ *
+ * Note: @ht cannot be accessed from @func
+ * See also: qht_iter_remove()
  */
 void qht_iter(struct qht *ht, qht_iter_func_t func, void *userp);
 
 /**
+ * qht_iter_remove - Iterate over a QHT, optionally removing entries
+ * @ht: QHT to be iterated over
+ * @func: function to be called for each entry in QHT
+ * @userp: additional pointer to be passed to @func
+ *
+ * Each time it is called, user-provided @func is passed a pointer-hash pair,
+ * plus @userp. If @func returns true, the pointer-hash pair is removed.
+ *
+ * Note: @ht cannot be accessed from @func
+ * See also: qht_iter()
+ */
+void qht_iter_remove(struct qht *ht, qht_iter_bool_func_t func, void *userp);
+
+/**
  * qht_statistics_init - Gather statistics from a QHT
  * @ht: QHT to gather statistics from
  * @stats: pointer to a &struct qht_stats to be filled in
@@ -193,7 +211,7 @@ void qht_iter(struct qht *ht, qht_iter_func_t func, void *userp);
  * When done with @stats, pass the struct to qht_statistics_destroy().
  * Failing to do this will leak memory.
  */
-void qht_statistics_init(struct qht *ht, struct qht_stats *stats);
+void qht_statistics_init(const struct qht *ht, struct qht_stats *stats);
 
 /**
  * qht_statistics_destroy - Destroy a &struct qht_stats