X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fkernel-consumer.c;h=9ccad8be4e87dd19cd4e0212acbbd64c4330a4af;hp=05e30e49cb0b9ff65e88534ae9cec25de2222693;hb=9c9d917cfe2e6a9f35ef82cb64e442451210716f;hpb=1624d5b7ba86633d36f3a5c86ea1df5d308c4360

diff --git a/src/bin/lttng-sessiond/kernel-consumer.c b/src/bin/lttng-sessiond/kernel-consumer.c
index 05e30e49c..9ccad8be4 100644
--- a/src/bin/lttng-sessiond/kernel-consumer.c
+++ b/src/bin/lttng-sessiond/kernel-consumer.c
@@ -15,88 +15,152 @@
  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#define _GNU_SOURCE
+#define _LGPL_SOURCE
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
 #include <sys/stat.h>
 #include <unistd.h>
+#include <inttypes.h>
 
 #include <common/common.h>
 #include <common/defaults.h>
+#include <common/compat/string.h>
 
 #include "consumer.h"
-#include "health.h"
+#include "health-sessiond.h"
 #include "kernel-consumer.h"
+#include "notification-thread-commands.h"
+#include "session.h"
+#include "lttng-sessiond.h"
 
-/*
- * Sending a single channel to the consumer with command ADD_CHANNEL.
- */
-int kernel_consumer_add_channel(struct consumer_socket *sock,
-		struct ltt_kernel_channel *channel, struct ltt_kernel_session *session)
+static char *create_channel_path(struct consumer_output *consumer,
+		uid_t uid, gid_t gid)
 {
 	int ret;
 	char tmp_path[PATH_MAX];
-	const char *pathname;
-	struct lttcomm_consumer_msg lkm;
-	struct consumer_output *consumer;
+	char *pathname = NULL;
 
-	/* Safety net */
-	assert(channel);
-	assert(session);
-	assert(session->consumer);
-
-	consumer = session->consumer;
-
-	DBG("Kernel consumer adding channel %s to kernel consumer",
-			channel->channel->name);
+	assert(consumer);
 
 	/* Get the right path name destination */
 	if (consumer->type == CONSUMER_DST_LOCAL) {
 		/* Set application path to the destination path */
-		ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
-				consumer->dst.trace_path, consumer->subdir);
+		ret = snprintf(tmp_path, sizeof(tmp_path), "%s%s%s",
+				consumer->dst.session_root_path,
+				consumer->chunk_path,
+				consumer->subdir);
 		if (ret < 0) {
-			PERROR("snprintf metadata path");
+			PERROR("snprintf kernel channel path");
+			goto error;
+		} else if (ret >= sizeof(tmp_path)) {
+			ERR("Kernel channel path exceeds the maximal allowed length of of %zu bytes (%i bytes required) with path \"%s%s%s\"",
+					sizeof(tmp_path), ret,
+					consumer->dst.session_root_path,
+					consumer->chunk_path,
+					consumer->subdir);
+			goto error;
+		}
+		pathname = lttng_strndup(tmp_path, sizeof(tmp_path));
+		if (!pathname) {
+			PERROR("lttng_strndup");
 			goto error;
 		}
-		pathname = tmp_path;
 
 		/* Create directory */
-		ret = run_as_mkdir_recursive(pathname, S_IRWXU | S_IRWXG,
-				session->uid, session->gid);
+		ret = run_as_mkdir_recursive(pathname, S_IRWXU | S_IRWXG, uid, gid);
 		if (ret < 0) {
-			if (ret != -EEXIST) {
+			if (errno != EEXIST) {
 				ERR("Trace directory creation error");
 				goto error;
 			}
 		}
 		DBG3("Kernel local consumer tracefile path: %s", pathname);
 	} else {
-		ret = snprintf(tmp_path, sizeof(tmp_path), "%s", consumer->subdir);
+		ret = snprintf(tmp_path, sizeof(tmp_path), "%s%s",
+				consumer->dst.net.base_dir,
+				consumer->subdir);
 		if (ret < 0) {
-			PERROR("snprintf metadata path");
+			PERROR("snprintf kernel metadata path");
+			goto error;
+		} else if (ret >= sizeof(tmp_path)) {
+			ERR("Kernel channel path exceeds the maximal allowed length of of %zu bytes (%i bytes required) with path \"%s%s\"",
+					sizeof(tmp_path), ret,
+					consumer->dst.net.base_dir,
+					consumer->subdir);
+			goto error;
+		}
+		pathname = lttng_strndup(tmp_path, sizeof(tmp_path));
+		if (!pathname) {
+			PERROR("lttng_strndup");
 			goto error;
 		}
-		pathname = tmp_path;
 		DBG3("Kernel network consumer subdir path: %s", pathname);
 	}
 
+	return pathname;
+
+error:
+	free(pathname);
+	return NULL;
+}
+
+/*
+ * Sending a single channel to the consumer with command ADD_CHANNEL.
+ */
+int kernel_consumer_add_channel(struct consumer_socket *sock,
+		struct ltt_kernel_channel *channel,
+		struct ltt_kernel_session *ksession,
+		unsigned int monitor)
+{
+	int ret;
+	char *pathname;
+	struct lttcomm_consumer_msg lkm;
+	struct consumer_output *consumer;
+	enum lttng_error_code status;
+	struct ltt_session *session = NULL;
+	struct lttng_channel_extended *channel_attr_extended;
+
+	/* Safety net */
+	assert(channel);
+	assert(ksession);
+	assert(ksession->consumer);
+
+	consumer = ksession->consumer;
+	channel_attr_extended = (struct lttng_channel_extended *)
+			channel->channel->attr.extended.ptr;
+
+	DBG("Kernel consumer adding channel %s to kernel consumer",
+			channel->channel->name);
+
+	if (monitor) {
+		pathname = create_channel_path(consumer, ksession->uid,
+				ksession->gid);
+	} else {
+		/* Empty path. */
+		pathname = strdup("");
+	}
+	if (!pathname) {
+		ret = -1;
+		goto error;
+	}
+
 	/* Prep channel message structure */
-	consumer_init_channel_comm_msg(&lkm,
-			LTTNG_CONSUMER_ADD_CHANNEL,
-			channel->fd,
-			session->id,
+	consumer_init_add_channel_comm_msg(&lkm,
+			channel->key,
+			ksession->id,
 			pathname,
-			session->uid,
-			session->gid,
+			ksession->uid,
+			ksession->gid,
 			consumer->net_seq_index,
 			channel->channel->name,
 			channel->stream_count,
 			channel->channel->attr.output,
 			CONSUMER_CHANNEL_TYPE_DATA,
 			channel->channel->attr.tracefile_size,
-			channel->channel->attr.tracefile_count);
+			channel->channel->attr.tracefile_count,
+			monitor,
+			channel->channel->attr.live_timer_interval,
+			channel_attr_extended->monitor_timer_interval);
 
 	health_code_update();
 
@@ -106,78 +170,92 @@ int kernel_consumer_add_channel(struct consumer_socket *sock,
 	}
 
 	health_code_update();
+	rcu_read_lock();
+	session = session_find_by_id(ksession->id);
+	assert(session);
+	assert(pthread_mutex_trylock(&session->lock));
+	assert(session_trylock_list());
+
+	status = notification_thread_command_add_channel(
+			notification_thread_handle, session->name,
+			ksession->uid, ksession->gid,
+			channel->channel->name, channel->key,
+			LTTNG_DOMAIN_KERNEL,
+			channel->channel->attr.subbuf_size * channel->channel->attr.num_subbuf);
+	rcu_read_unlock();
+	if (status != LTTNG_OK) {
+		ret = -1;
+		goto error;
+	}
+
+	channel->published_to_notification_thread = true;
 
 error:
+	if (session) {
+		session_put(session);
+	}
+	free(pathname);
 	return ret;
 }
 
 /*
  * Sending metadata to the consumer with command ADD_CHANNEL and ADD_STREAM.
+ *
+ * The consumer socket lock must be held by the caller.
  */
 int kernel_consumer_add_metadata(struct consumer_socket *sock,
-		struct ltt_kernel_session *session)
+		struct ltt_kernel_session *ksession, unsigned int monitor)
 {
 	int ret;
-	char tmp_path[PATH_MAX];
-	const char *pathname;
+	char *pathname;
 	struct lttcomm_consumer_msg lkm;
 	struct consumer_output *consumer;
+	struct ltt_session *session = NULL;
+
+	rcu_read_lock();
 
 	/* Safety net */
-	assert(session);
-	assert(session->consumer);
+	assert(ksession);
+	assert(ksession->consumer);
 	assert(sock);
 
-	DBG("Sending metadata %d to kernel consumer", session->metadata_stream_fd);
+	DBG("Sending metadata %d to kernel consumer",
+			ksession->metadata_stream_fd);
 
 	/* Get consumer output pointer */
-	consumer = session->consumer;
+	consumer = ksession->consumer;
 
-	/* Get the right path name destination */
-	if (consumer->type == CONSUMER_DST_LOCAL) {
-		/* Set application path to the destination path */
-		ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
-				consumer->dst.trace_path, consumer->subdir);
-		if (ret < 0) {
-			PERROR("snprintf metadata path");
-			goto error;
-		}
-		pathname = tmp_path;
-
-		/* Create directory */
-		ret = run_as_mkdir_recursive(pathname, S_IRWXU | S_IRWXG,
-				session->uid, session->gid);
-		if (ret < 0) {
-			if (ret != -EEXIST) {
-				ERR("Trace directory creation error");
-				goto error;
-			}
-		}
-		DBG3("Kernel local consumer tracefile path: %s", pathname);
+	if (monitor) {
+		pathname = create_channel_path(consumer,
+				ksession->uid, ksession->gid);
 	} else {
-		ret = snprintf(tmp_path, sizeof(tmp_path), "%s", consumer->subdir);
-		if (ret < 0) {
-			PERROR("snprintf metadata path");
-			goto error;
-		}
-		pathname = tmp_path;
-		DBG3("Kernel network consumer subdir path: %s", pathname);
+		/* Empty path. */
+		pathname = strdup("");
+	}
+	if (!pathname) {
+		ret = -1;
+		goto error;
 	}
 
+	session = session_find_by_id(ksession->id);
+	assert(session);
+	assert(pthread_mutex_trylock(&session->lock));
+	assert(session_trylock_list());
+
 	/* Prep channel message structure */
-	consumer_init_channel_comm_msg(&lkm,
-			LTTNG_CONSUMER_ADD_CHANNEL,
-			session->metadata->fd,
-			session->id,
+	consumer_init_add_channel_comm_msg(&lkm,
+			ksession->metadata->key,
+			ksession->id,
 			pathname,
-			session->uid,
-			session->gid,
+			ksession->uid,
+			ksession->gid,
 			consumer->net_seq_index,
 			DEFAULT_METADATA_NAME,
 			1,
 			DEFAULT_KERNEL_CHANNEL_OUTPUT,
 			CONSUMER_CHANNEL_TYPE_METADATA,
-			0, 0);
+			0, 0,
+			monitor, 0, 0);
 
 	health_code_update();
 
@@ -189,17 +267,17 @@ int kernel_consumer_add_metadata(struct consumer_socket *sock,
 	health_code_update();
 
 	/* Prep stream message structure */
-	consumer_init_stream_comm_msg(&lkm,
-			LTTNG_CONSUMER_ADD_STREAM,
-			session->metadata->fd,
-			session->metadata_stream_fd,
-			0); /* CPU: 0 for metadata. */
+	consumer_init_add_stream_comm_msg(&lkm,
+			ksession->metadata->key,
+			ksession->metadata_stream_fd,
+			0 /* CPU: 0 for metadata. */,
+			session->current_archive_id);
 
 	health_code_update();
 
 	/* Send stream and file descriptor */
 	ret = consumer_send_stream(sock, consumer, &lkm,
-			&session->metadata_stream_fd, 1);
+			&ksession->metadata_stream_fd, 1);
 	if (ret < 0) {
 		goto error;
 	}
@@ -207,15 +285,23 @@ int kernel_consumer_add_metadata(struct consumer_socket *sock,
 	health_code_update();
 
 error:
+	rcu_read_unlock();
+	free(pathname);
+	if (session) {
+		session_put(session);
+	}
 	return ret;
 }
 
 /*
  * Sending a single stream to the consumer with command ADD_STREAM.
  */
+static
 int kernel_consumer_add_stream(struct consumer_socket *sock,
-		struct ltt_kernel_channel *channel, struct ltt_kernel_stream *stream,
-		struct ltt_kernel_session *session)
+		struct ltt_kernel_channel *channel,
+		struct ltt_kernel_stream *stream,
+		struct ltt_kernel_session *session, unsigned int monitor,
+		uint64_t trace_archive_id)
 {
 	int ret;
 	struct lttcomm_consumer_msg lkm;
@@ -234,11 +320,11 @@ int kernel_consumer_add_stream(struct consumer_socket *sock,
 	consumer = session->consumer;
 
 	/* Prep stream consumer message */
-	consumer_init_stream_comm_msg(&lkm,
-			LTTNG_CONSUMER_ADD_STREAM,
-			channel->fd,
+	consumer_init_add_stream_comm_msg(&lkm,
+			channel->key,
 			stream->fd,
-			stream->cpu);
+			stream->cpu,
+			trace_archive_id);
 
 	health_code_update();
 
@@ -255,22 +341,67 @@ error:
 }
 
 /*
- * Send all stream fds of kernel channel to the consumer.
+ * Sending the notification that all streams were sent with STREAMS_SENT.
  */
-int kernel_consumer_send_channel_stream(struct consumer_socket *sock,
-		struct ltt_kernel_channel *channel, struct ltt_kernel_session *session)
+int kernel_consumer_streams_sent(struct consumer_socket *sock,
+		struct ltt_kernel_session *session, uint64_t channel_key)
 {
 	int ret;
+	struct lttcomm_consumer_msg lkm;
+	struct consumer_output *consumer;
+
+	assert(sock);
+	assert(session);
+
+	DBG("Sending streams_sent");
+	/* Get consumer output pointer */
+	consumer = session->consumer;
+
+	/* Prep stream consumer message */
+	consumer_init_streams_sent_comm_msg(&lkm,
+			LTTNG_CONSUMER_STREAMS_SENT,
+			channel_key, consumer->net_seq_index);
+
+	health_code_update();
+
+	/* Send stream and file descriptor */
+	ret = consumer_send_msg(sock, &lkm);
+	if (ret < 0) {
+		goto error;
+	}
+
+error:
+	return ret;
+}
+
+/*
+ * Send all stream fds of kernel channel to the consumer.
+ *
+ * The consumer socket lock must be held by the caller.
+ */
+int kernel_consumer_send_channel_streams(struct consumer_socket *sock,
+		struct ltt_kernel_channel *channel, struct ltt_kernel_session *ksession,
+		unsigned int monitor)
+{
+	int ret = LTTNG_OK;
 	struct ltt_kernel_stream *stream;
+	struct ltt_session *session = NULL;
 
 	/* Safety net */
 	assert(channel);
-	assert(session);
-	assert(session->consumer);
+	assert(ksession);
+	assert(ksession->consumer);
 	assert(sock);
 
+	rcu_read_lock();
+
+	session = session_find_by_id(ksession->id);
+	assert(session);
+	assert(pthread_mutex_trylock(&session->lock));
+	assert(session_trylock_list());
+
 	/* Bail out if consumer is disabled */
-	if (!session->consumer->enabled) {
+	if (!ksession->consumer->enabled) {
 		ret = LTTNG_OK;
 		goto error;
 	}
@@ -278,35 +409,46 @@ int kernel_consumer_send_channel_stream(struct consumer_socket *sock,
 	DBG("Sending streams of channel %s to kernel consumer",
 			channel->channel->name);
 
-	ret = kernel_consumer_add_channel(sock, channel, session);
-	if (ret < 0) {
-		goto error;
+	if (!channel->sent_to_consumer) {
+		ret = kernel_consumer_add_channel(sock, channel, ksession, monitor);
+		if (ret < 0) {
+			goto error;
+		}
+		channel->sent_to_consumer = true;
 	}
 
 	/* Send streams */
 	cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
-		if (!stream->fd) {
+		if (!stream->fd || stream->sent_to_consumer) {
 			continue;
 		}
 
 		/* Add stream on the kernel consumer side. */
-		ret = kernel_consumer_add_stream(sock, channel, stream, session);
+		ret = kernel_consumer_add_stream(sock, channel, stream,
+				ksession, monitor, session->current_archive_id);
 		if (ret < 0) {
 			goto error;
 		}
+		stream->sent_to_consumer = true;
 	}
 
 error:
+	rcu_read_unlock();
+	if (session) {
+		session_put(session);
+	}
 	return ret;
 }
 
 /*
  * Send all stream fds of the kernel session to the consumer.
+ *
+ * The consumer socket lock must be held by the caller.
  */
 int kernel_consumer_send_session(struct consumer_socket *sock,
 		struct ltt_kernel_session *session)
 {
-	int ret;
+	int ret, monitor = 0;
 	struct ltt_kernel_channel *chan;
 
 	/* Safety net */
@@ -320,30 +462,102 @@ int kernel_consumer_send_session(struct consumer_socket *sock,
 		goto error;
 	}
 
+	/* Don't monitor the streams on the consumer if in flight recorder. */
+	if (session->output_traces) {
+		monitor = 1;
+	}
+
 	DBG("Sending session stream to kernel consumer");
 
-	if (session->metadata_stream_fd >= 0) {
-		ret = kernel_consumer_add_metadata(sock, session);
+	if (session->metadata_stream_fd >= 0 && session->metadata) {
+		ret = kernel_consumer_add_metadata(sock, session, monitor);
 		if (ret < 0) {
 			goto error;
 		}
-
-		/* Flag that at least the metadata has been sent to the consumer. */
-		session->consumer_fds_sent = 1;
 	}
 
 	/* Send channel and streams of it */
 	cds_list_for_each_entry(chan, &session->channel_list.head, list) {
-		ret = kernel_consumer_send_channel_stream(sock, chan, session);
+		ret = kernel_consumer_send_channel_streams(sock, chan, session,
+				monitor);
 		if (ret < 0) {
 			goto error;
 		}
+		if (monitor) {
+			/*
+			 * Inform the relay that all the streams for the
+			 * channel were sent.
+			 */
+			ret = kernel_consumer_streams_sent(sock, session, chan->key);
+			if (ret < 0) {
+				goto error;
+			}
+		}
 	}
 
 	DBG("Kernel consumer FDs of metadata and channel streams sent");
 
+	session->consumer_fds_sent = 1;
 	return 0;
 
 error:
 	return ret;
 }
+
+int kernel_consumer_destroy_channel(struct consumer_socket *socket,
+		struct ltt_kernel_channel *channel)
+{
+	int ret;
+	struct lttcomm_consumer_msg msg;
+
+	assert(channel);
+	assert(socket);
+
+	DBG("Sending kernel consumer destroy channel key %" PRIu64, channel->key);
+
+	memset(&msg, 0, sizeof(msg));
+	msg.cmd_type = LTTNG_CONSUMER_DESTROY_CHANNEL;
+	msg.u.destroy_channel.key = channel->key;
+
+	pthread_mutex_lock(socket->lock);
+	health_code_update();
+
+	ret = consumer_send_msg(socket, &msg);
+	if (ret < 0) {
+		goto error;
+	}
+
+error:
+	health_code_update();
+	pthread_mutex_unlock(socket->lock);
+	return ret;
+}
+
+int kernel_consumer_destroy_metadata(struct consumer_socket *socket,
+		struct ltt_kernel_metadata *metadata)
+{
+	int ret;
+	struct lttcomm_consumer_msg msg;
+
+	assert(metadata);
+	assert(socket);
+
+	DBG("Sending kernel consumer destroy channel key %" PRIu64, metadata->key);
+
+	memset(&msg, 0, sizeof(msg));
+	msg.cmd_type = LTTNG_CONSUMER_DESTROY_CHANNEL;
+	msg.u.destroy_channel.key = metadata->key;
+
+	pthread_mutex_lock(socket->lock);
+	health_code_update();
+
+	ret = consumer_send_msg(socket, &msg);
+	if (ret < 0) {
+		goto error;
+	}
+
+error:
+	health_code_update();
+	pthread_mutex_unlock(socket->lock);
+	return ret;
+}