X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fust-registry.c;h=93131abaae1b8a1474591441b662a590111cf8d0;hp=e22fc6fcfbfc93246172db98e398be6783b99285;hb=HEAD;hpb=52d8ccce6a092485def268cb278485d2820c4954 diff --git a/src/bin/lttng-sessiond/ust-registry.c b/src/bin/lttng-sessiond/ust-registry.c deleted file mode 100644 index e22fc6fcf..000000000 --- a/src/bin/lttng-sessiond/ust-registry.c +++ /dev/null @@ -1,561 +0,0 @@ -/* - * Copyright (C) 2013 - David Goulet - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License, version 2 only, as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program; if not, write to the Free Software Foundation, Inc., 51 - * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ -#define _GNU_SOURCE -#include -#include - -#include -#include -#include - -#include "ust-registry.h" -#include "utils.h" - -/* - * Hash table match function for event in the registry. - */ -static int ht_match_event(struct cds_lfht_node *node, const void *_key) -{ - struct ust_registry_event *event; - const struct ust_registry_event *key; - - assert(node); - assert(_key); - - event = caa_container_of(node, struct ust_registry_event, node.node); - assert(event); - key = _key; - - /* It has to be a perfect match. */ - if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { - goto no_match; - } - - /* It has to be a perfect match. */ - if (strncmp(event->signature, key->signature, - strlen(event->signature) != 0)) { - goto no_match; - } - - /* Match */ - return 1; - -no_match: - return 0; -} - -static unsigned long ht_hash_event(void *_key, unsigned long seed) -{ - uint64_t xored_key; - struct ust_registry_event *key = _key; - - assert(key); - - xored_key = (uint64_t) (hash_key_str(key->name, seed) ^ - hash_key_str(key->signature, seed)); - - return hash_key_u64(&xored_key, seed); -} - -/* - * Allocate event and initialize it. This does NOT set a valid event id from a - * registry. - */ -static struct ust_registry_event *alloc_event(int session_objd, - int channel_objd, char *name, char *sig, size_t nr_fields, - struct ustctl_field *fields, int loglevel, char *model_emf_uri) -{ - struct ust_registry_event *event = NULL; - - event = zmalloc(sizeof(*event)); - if (!event) { - PERROR("zmalloc ust registry event"); - goto error; - } - - event->session_objd = session_objd; - event->channel_objd = channel_objd; - /* Allocated by ustctl. */ - event->signature = sig; - event->nr_fields = nr_fields; - event->fields = fields; - event->loglevel = loglevel; - event->model_emf_uri = model_emf_uri; - if (name) { - /* Copy event name and force NULL byte. */ - strncpy(event->name, name, sizeof(event->name)); - event->name[sizeof(event->name) - 1] = '\0'; - } - cds_lfht_node_init(&event->node.node); - -error: - return event; -} - -/* - * Free event data structure. This does NOT delete it from any hash table. It's - * safe to pass a NULL pointer. This shoudl be called inside a call RCU if the - * event is previously deleted from a rcu hash table. - */ -static void destroy_event(struct ust_registry_event *event) -{ - if (!event) { - return; - } - - free(event->fields); - free(event->model_emf_uri); - free(event->signature); - free(event); -} - -/* - * Destroy event function call of the call RCU. - */ -static void destroy_event_rcu(struct rcu_head *head) -{ - struct lttng_ht_node_u64 *node = - caa_container_of(head, struct lttng_ht_node_u64, head); - struct ust_registry_event *event = - caa_container_of(node, struct ust_registry_event, node); - - destroy_event(event); -} - -/* - * Find an event using the name and signature in the given registry. RCU read - * side lock MUST be acquired before calling this function and as long as the - * event reference is kept by the caller. - * - * On success, the event pointer is returned else NULL. - */ -struct ust_registry_event *ust_registry_find_event( - struct ust_registry_channel *chan, char *name, char *sig) -{ - struct lttng_ht_node_u64 *node; - struct lttng_ht_iter iter; - struct ust_registry_event *event = NULL; - struct ust_registry_event key; - - assert(chan); - assert(name); - assert(sig); - - /* Setup key for the match function. */ - strncpy(key.name, name, sizeof(key.name)); - key.name[sizeof(key.name) - 1] = '\0'; - key.signature = sig; - - cds_lfht_lookup(chan->ht->ht, chan->ht->hash_fct(&key, lttng_ht_seed), - chan->ht->match_fct, &key, &iter.iter); - node = lttng_ht_iter_get_node_u64(&iter); - if (!node) { - goto end; - } - event = caa_container_of(node, struct ust_registry_event, node); - -end: - return event; -} - -/* - * Create a ust_registry_event from the given parameters and add it to the - * registry hash table. If event_id is valid, it is set with the newly created - * event id. - * - * On success, return 0 else a negative value. The created event MUST be unique - * so on duplicate entry -EINVAL is returned. On error, event_id is untouched. - * - * Should be called with session registry mutex held. - */ -int ust_registry_create_event(struct ust_registry_session *session, - uint64_t chan_key, int session_objd, int channel_objd, char *name, - char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, - char *model_emf_uri, int buffer_type, uint32_t *event_id_p) -{ - int ret; - uint32_t event_id; - struct cds_lfht_node *nptr; - struct ust_registry_event *event = NULL; - struct ust_registry_channel *chan; - - assert(session); - assert(name); - assert(sig); - assert(event_id_p); - - 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 || channel_objd < 0) { - ret = -EINVAL; - goto error_free; - } - - chan = ust_registry_channel_find(session, chan_key); - if (!chan) { - ret = -EINVAL; - goto error_free; - } - - /* Check if we've reached the maximum possible id. */ - if (ust_registry_is_max_id(chan->used_event_id)) { - ret = -ENOENT; - goto error_free; - } - - event = alloc_event(session_objd, channel_objd, name, sig, nr_fields, - fields, loglevel, model_emf_uri); - if (!event) { - ret = -ENOMEM; - goto error_free; - } - - DBG3("UST registry creating event with event: %s, sig: %s, id: %u, " - "chan_objd: %u, sess_objd: %u, chan_id: %u", event->name, - event->signature, event->id, event->channel_objd, - event->session_objd, chan->chan_id); - - /* - * This is an add unique with a custom match function for event. The node - * are matched using the event name and signature. - */ - nptr = cds_lfht_add_unique(chan->ht->ht, chan->ht->hash_fct(event, - lttng_ht_seed), chan->ht->match_fct, event, &event->node.node); - if (nptr != &event->node.node) { - if (buffer_type == LTTNG_BUFFER_PER_UID) { - /* - * This is normal, we just have to send the event id of the - * returned node and make sure we destroy the previously allocated - * event object. - */ - destroy_event(event); - event = caa_container_of(nptr, struct ust_registry_event, - node.node); - assert(event); - event_id = event->id; - } else { - ERR("UST registry create event add unique failed for event: %s, " - "sig: %s, id: %u, chan_objd: %u, sess_objd: %u", - event->name, event->signature, event->id, - event->channel_objd, event->session_objd); - ret = -EINVAL; - goto error_unlock; - } - } else { - /* Request next event id if the node was successfully added. */ - event_id = event->id = ust_registry_get_next_event_id(chan); - } - - *event_id_p = event_id; - - if (!event->metadata_dumped) { - /* Append to metadata */ - ret = ust_metadata_event_statedump(session, chan, event); - if (ret) { - ERR("Error appending event metadata (errno = %d)", ret); - rcu_read_unlock(); - return ret; - } - } - - rcu_read_unlock(); - return 0; - -error_free: - free(sig); - free(fields); - free(model_emf_uri); -error_unlock: - rcu_read_unlock(); - destroy_event(event); - return ret; -} - -/* - * For a given event in a registry, delete the entry and destroy the event. - * This MUST be called within a RCU read side lock section. - */ -void ust_registry_destroy_event(struct ust_registry_channel *chan, - struct ust_registry_event *event) -{ - int ret; - struct lttng_ht_iter iter; - - assert(chan); - assert(event); - - /* Delete the node first. */ - iter.iter.node = &event->node.node; - ret = lttng_ht_del(chan->ht, &iter); - assert(!ret); - - call_rcu(&event->node.head, destroy_event_rcu); - - return; -} - -/* - * We need to execute ht_destroy outside of RCU read-side critical - * section and outside of call_rcu thread, so we postpone its execution - * using ht_cleanup_push. It is simpler than to change the semantic of - * the many callers of delete_ust_app_session(). - */ -static -void destroy_channel_rcu(struct rcu_head *head) -{ - struct ust_registry_channel *chan = - caa_container_of(head, struct ust_registry_channel, rcu_head); - - if (chan->ht) { - ht_cleanup_push(chan->ht); - } - free(chan->ctx_fields); - free(chan); -} - -/* - * Destroy every element of the registry and free the memory. This does NOT - * free the registry pointer since it might not have been allocated before so - * it's the caller responsability. - */ -static void destroy_channel(struct ust_registry_channel *chan) -{ - struct lttng_ht_iter iter; - struct ust_registry_event *event; - - assert(chan); - - rcu_read_lock(); - /* Destroy all event associated with this registry. */ - cds_lfht_for_each_entry(chan->ht->ht, &iter.iter, event, node.node) { - /* Delete the node from the ht and free it. */ - ust_registry_destroy_event(chan, event); - } - rcu_read_unlock(); - call_rcu(&chan->rcu_head, destroy_channel_rcu); -} - -/* - * Initialize registry with default values. - */ -int ust_registry_channel_add(struct ust_registry_session *session, - uint64_t key) -{ - int ret = 0; - struct ust_registry_channel *chan; - - assert(session); - - chan = zmalloc(sizeof(*chan)); - if (!chan) { - PERROR("zmalloc ust registry channel"); - ret = -ENOMEM; - goto error_alloc; - } - - chan->ht = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); - if (!chan->ht) { - ret = -ENOMEM; - goto error; - } - - /* Set custom match function. */ - chan->ht->match_fct = ht_match_event; - chan->ht->hash_fct = ht_hash_event; - - /* - * Assign a channel ID right now since the event notification comes - * *before* the channel notify so the ID needs to be set at this point so - * the metadata can be dumped for that event. - */ - if (ust_registry_is_max_id(session->used_channel_id)) { - ret = -1; - goto error; - } - chan->chan_id = ust_registry_get_next_chan_id(session); - - rcu_read_lock(); - lttng_ht_node_init_u64(&chan->node, key); - lttng_ht_add_unique_u64(session->channels, &chan->node); - rcu_read_unlock(); - - return 0; - -error: - destroy_channel(chan); -error_alloc: - return ret; -} - -/* - * Find a channel in the given registry. RCU read side lock MUST be acquired - * before calling this function and as long as the event reference is kept by - * the caller. - * - * On success, the pointer is returned else NULL. - */ -struct ust_registry_channel *ust_registry_channel_find( - struct ust_registry_session *session, uint64_t key) -{ - struct lttng_ht_node_u64 *node; - struct lttng_ht_iter iter; - struct ust_registry_channel *chan = NULL; - - assert(session); - assert(session->channels); - - DBG3("UST registry channel finding key %" PRIu64, key); - - lttng_ht_lookup(session->channels, &key, &iter); - node = lttng_ht_iter_get_node_u64(&iter); - if (!node) { - goto end; - } - chan = caa_container_of(node, struct ust_registry_channel, node); - -end: - return chan; -} - -/* - * Remove channel using key from registry and free memory. - */ -void ust_registry_channel_del_free(struct ust_registry_session *session, - uint64_t key) -{ - struct lttng_ht_iter iter; - struct ust_registry_channel *chan; - int ret; - - assert(session); - - rcu_read_lock(); - chan = ust_registry_channel_find(session, key); - if (!chan) { - rcu_read_unlock(); - goto end; - } - - iter.iter.node = &chan->node.node; - ret = lttng_ht_del(session->channels, &iter); - assert(!ret); - rcu_read_unlock(); - destroy_channel(chan); - -end: - return; -} - -/* - * Initialize registry with default values and set the newly allocated session - * pointer to sessionp. - * - * Return 0 on success and sessionp is set or else return -1 and sessionp is - * kept untouched. - */ -int ust_registry_session_init(struct ust_registry_session **sessionp, - struct ust_app *app, - uint32_t bits_per_long, - uint32_t uint8_t_alignment, - uint32_t uint16_t_alignment, - uint32_t uint32_t_alignment, - uint32_t uint64_t_alignment, - uint32_t long_alignment, - int byte_order, - uint32_t major, - uint32_t minor) -{ - int ret; - struct ust_registry_session *session; - - assert(sessionp); - - session = zmalloc(sizeof(*session)); - if (!session) { - PERROR("zmalloc ust registry session"); - goto error_alloc; - } - - pthread_mutex_init(&session->lock, NULL); - session->bits_per_long = bits_per_long; - session->uint8_t_alignment = uint8_t_alignment; - session->uint16_t_alignment = uint16_t_alignment; - session->uint32_t_alignment = uint32_t_alignment; - session->uint64_t_alignment = uint64_t_alignment; - session->long_alignment = long_alignment; - session->byte_order = byte_order; - - session->channels = lttng_ht_new(0, LTTNG_HT_TYPE_U64); - if (!session->channels) { - goto error; - } - - ret = lttng_uuid_generate(session->uuid); - if (ret) { - ERR("Failed to generate UST uuid (errno = %d)", ret); - goto error; - } - - pthread_mutex_lock(&session->lock); - ret = ust_metadata_session_statedump(session, app, major, minor); - pthread_mutex_unlock(&session->lock); - if (ret) { - ERR("Failed to generate session metadata (errno = %d)", ret); - goto error; - } - - *sessionp = session; - - return 0; - -error: - ust_registry_session_destroy(session); -error_alloc: - return -1; -} - -/* - * Destroy session registry. This does NOT free the given pointer since it - * might get passed as a reference. The registry lock should NOT be acquired. - */ -void ust_registry_session_destroy(struct ust_registry_session *reg) -{ - int ret; - struct lttng_ht_iter iter; - struct ust_registry_channel *chan; - - /* On error, EBUSY can be returned if lock. Code flow error. */ - ret = pthread_mutex_destroy(®->lock); - assert(!ret); - - rcu_read_lock(); - /* Destroy all event associated with this registry. */ - cds_lfht_for_each_entry(reg->channels->ht, &iter.iter, chan, node.node) { - /* Delete the node from the ht and free it. */ - ret = lttng_ht_del(reg->channels, &iter); - assert(!ret); - destroy_channel(chan); - } - rcu_read_unlock(); - - ht_cleanup_push(reg->channels); - free(reg->metadata); -}