return hash_key_u64(&xored_key, seed);
}
+static int compare_enums(const struct ust_registry_enum *reg_enum_a,
+ const struct ust_registry_enum *reg_enum_b)
+{
+ int ret = 0;
+ size_t i;
+
+ assert(strcmp(reg_enum_a->name, reg_enum_b->name) == 0);
+ if (reg_enum_a->nr_entries != reg_enum_b->nr_entries) {
+ ret = -1;
+ goto end;
+ }
+ for (i = 0; i < reg_enum_a->nr_entries; i++) {
+ const struct ustctl_enum_entry *entries_a, *entries_b;
+
+ entries_a = ®_enum_a->entries[i];
+ entries_b = ®_enum_b->entries[i];
+ if (entries_a->start != entries_b->start) {
+ ret = -1;
+ goto end;
+ }
+ if (entries_a->end != entries_b->end) {
+ ret = -1;
+ goto end;
+ }
+ if (strcmp(entries_a->string, entries_b->string)) {
+ ret = -1;
+ goto end;
+ }
+ }
+end:
+ return ret;
+}
+
+/*
+ * Hash table match function for enumerations in the session. Match is
+ * performed on enumeration name, and confirmed by comparing the enum
+ * entries.
+ */
+static int ht_match_enum(struct cds_lfht_node *node, const void *_key)
+{
+ struct ust_registry_enum *_enum;
+ const struct ust_registry_enum *key;
+
+ assert(node);
+ assert(_key);
+
+ _enum = caa_container_of(node, struct ust_registry_enum,
+ node.node);
+ assert(_enum);
+ key = _key;
+
+ if (strncmp(_enum->name, key->name, LTTNG_UST_SYM_NAME_LEN)) {
+ goto no_match;
+ }
+ if (compare_enums(_enum, key)) {
+ goto no_match;
+ }
+
+ /* Match. */
+ return 1;
+
+no_match:
+ return 0;
+}
+
+/*
+ * Hash table match function for enumerations in the session. Match is
+ * performed by enumeration ID.
+ */
+static int ht_match_enum_id(struct cds_lfht_node *node, const void *_key)
+{
+ struct ust_registry_enum *_enum;
+ const struct ust_registry_enum *key = _key;
+
+ assert(node);
+ assert(_key);
+
+ _enum = caa_container_of(node, struct ust_registry_enum, node.node);
+ assert(_enum);
+
+ if (_enum->id != key->id) {
+ goto no_match;
+ }
+
+ /* Match. */
+ return 1;
+
+no_match:
+ return 0;
+}
+
+/*
+ * Hash table hash function for enumerations in the session. The
+ * enumeration name is used for hashing.
+ */
+static unsigned long ht_hash_enum(void *_key, unsigned long seed)
+{
+ struct ust_registry_enum *key = _key;
+
+ assert(key);
+ return hash_key_str(key->name, seed);
+}
+
/*
* Return negative value on error, 0 if OK.
*
return;
}
+static void destroy_enum(struct ust_registry_enum *reg_enum)
+{
+ if (!reg_enum) {
+ return;
+ }
+ free(reg_enum->entries);
+ free(reg_enum);
+}
+
+static void destroy_enum_rcu(struct rcu_head *head)
+{
+ struct ust_registry_enum *reg_enum =
+ caa_container_of(head, struct ust_registry_enum, rcu_head);
+
+ destroy_enum(reg_enum);
+}
+
+/*
+ * Lookup enumeration by name and comparing enumeration entries.
+ * Needs to be called from RCU read-side critical section.
+ */
+struct ust_registry_enum *
+ ust_registry_lookup_enum(struct ust_registry_session *session,
+ const struct ust_registry_enum *reg_enum_lookup)
+{
+ struct ust_registry_enum *reg_enum = NULL;
+ struct lttng_ht_node_str *node;
+ struct lttng_ht_iter iter;
+
+ cds_lfht_lookup(session->enums->ht,
+ ht_hash_enum((void *) ®_enum_lookup, lttng_ht_seed),
+ ht_match_enum, ®_enum_lookup, &iter.iter);
+ node = lttng_ht_iter_get_node_str(&iter);
+ if (!node) {
+ goto end;
+ }
+ reg_enum = caa_container_of(node, struct ust_registry_enum, node);
+end:
+ return reg_enum;
+}
+
+/*
+ * Lookup enumeration by enum ID.
+ * Needs to be called from RCU read-side critical section.
+ */
+struct ust_registry_enum *
+ ust_registry_lookup_enum_by_id(struct ust_registry_session *session,
+ const char *enum_name, uint64_t enum_id)
+{
+ struct ust_registry_enum *reg_enum = NULL;
+ struct lttng_ht_node_str *node;
+ struct lttng_ht_iter iter;
+ struct ust_registry_enum reg_enum_lookup;
+
+ memset(®_enum_lookup, 0, sizeof(reg_enum_lookup));
+ strncpy(reg_enum_lookup.name, enum_name, LTTNG_UST_SYM_NAME_LEN);
+ reg_enum_lookup.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
+ reg_enum_lookup.id = enum_id;
+ cds_lfht_lookup(session->enums->ht,
+ ht_hash_enum((void *) ®_enum_lookup, lttng_ht_seed),
+ ht_match_enum_id, ®_enum_lookup, &iter.iter);
+ node = lttng_ht_iter_get_node_str(&iter);
+ if (!node) {
+ goto end;
+ }
+ reg_enum = caa_container_of(node, struct ust_registry_enum, node);
+end:
+ return reg_enum;
+}
+
+/*
+ * Create a ust_registry_enum from the given parameters and add it to the
+ * registry hash table, or find it if already there.
+ *
+ * On success, return 0 else a negative value.
+ *
+ * Should be called with session registry mutex held.
+ *
+ * We receive ownership of entries.
+ */
+int ust_registry_create_or_find_enum(struct ust_registry_session *session,
+ int session_objd, char *enum_name,
+ struct ustctl_enum_entry *entries, size_t nr_entries,
+ uint64_t *enum_id)
+{
+ int ret = 0;
+ struct cds_lfht_node *nodep;
+ struct ust_registry_enum *reg_enum = NULL, *old_reg_enum;
+
+ assert(session);
+ assert(enum_name);
+
+ rcu_read_lock();
+
+ /*
+ * This should not happen but since it comes from the UST tracer, an
+ * external party, don't assert and simply validate values.
+ */
+ if (session_objd < 0) {
+ ret = -EINVAL;
+ goto end;
+ }
+
+ /* Check if the enumeration was already dumped */
+ reg_enum = zmalloc(sizeof(*reg_enum));
+ if (!reg_enum) {
+ PERROR("zmalloc ust registry enumeration");
+ ret = -ENOMEM;
+ goto end;
+ }
+ strncpy(reg_enum->name, enum_name, LTTNG_UST_SYM_NAME_LEN);
+ reg_enum->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
+ /* entries will be owned by reg_enum. */
+ reg_enum->entries = entries;
+ reg_enum->nr_entries = nr_entries;
+ entries = NULL;
+
+ old_reg_enum = ust_registry_lookup_enum(session, reg_enum);
+ if (old_reg_enum) {
+ DBG("enum %s already in sess_objd: %u", enum_name, session_objd);
+ /* Fall through. Use prior enum. */
+ destroy_enum(reg_enum);
+ reg_enum = old_reg_enum;
+ } else {
+ DBG("UST registry creating enum: %s, sess_objd: %u",
+ enum_name, session_objd);
+ if (session->next_enum_id == -1ULL) {
+ ret = -EOVERFLOW;
+ destroy_enum(reg_enum);
+ goto end;
+ }
+ reg_enum->id = session->next_enum_id++;
+ cds_lfht_node_init(®_enum->node.node);
+ nodep = cds_lfht_add_unique(session->enums->ht,
+ ht_hash_enum(reg_enum, lttng_ht_seed),
+ ht_match_enum_id, reg_enum,
+ ®_enum->node.node);
+ assert(nodep == ®_enum->node.node);
+ }
+ DBG("UST registry reply with enum %s with id %" PRIu64 " in sess_objd: %u",
+ enum_name, reg_enum->id, session_objd);
+ *enum_id = reg_enum->id;
+end:
+ free(entries);
+ rcu_read_unlock();
+ return ret;
+}
+
+/*
+ * For a given enumeration in a registry, delete the entry and destroy
+ * the enumeration.
+ * This MUST be called within a RCU read side lock section.
+ */
+void ust_registry_destroy_enum(struct ust_registry_session *reg_session,
+ struct ust_registry_enum *reg_enum)
+{
+ int ret;
+ struct lttng_ht_iter iter;
+
+ assert(reg_session);
+ assert(reg_enum);
+
+ /* Delete the node first. */
+ iter.iter.node = ®_enum->node.node;
+ ret = lttng_ht_del(reg_session->enums, &iter);
+ assert(!ret);
+ call_rcu(®_enum->rcu_head, destroy_enum_rcu);
+}
+
/*
* We need to execute ht_destroy outside of RCU read-side critical
* section and outside of call_rcu thread, so we postpone its execution
session->metadata_fd = -1;
session->uid = euid;
session->gid = egid;
+ session->next_enum_id = 0;
strncpy(session->root_shm_path, root_shm_path,
sizeof(session->root_shm_path));
session->root_shm_path[sizeof(session->root_shm_path) - 1] = '\0';
session->metadata_fd = ret;
}
+ session->enums = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
+ if (!session->enums) {
+ ret = -ENOMEM;
+ goto error;
+ }
+ /* hash/match functions are specified at call site. */
+ session->enums->match_fct = NULL;
+ session->enums->hash_fct = NULL;
+
session->channels = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
if (!session->channels) {
goto error;
int ret;
struct lttng_ht_iter iter;
struct ust_registry_channel *chan;
+ struct ust_registry_enum *reg_enum;
if (!reg) {
return;
(void) run_as_recursive_rmdir(reg->root_shm_path,
reg->uid, reg->gid);
}
+ /* Destroy the enum hash table */
+ if (reg->enums) {
+ rcu_read_lock();
+ /* Destroy all enum entries associated with this registry. */
+ cds_lfht_for_each_entry(reg->enums->ht, &iter.iter, reg_enum,
+ node.node) {
+ ust_registry_destroy_enum(reg, reg_enum);
+ }
+ rcu_read_unlock();
+ ht_cleanup_push(reg->enums);
+ }
}
projects / lttng-tools.git / blobdiff