X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fkernel-consumer.c;h=9622d3058941e6cbe79ffac6528356b14b0a00ad;hp=bbf50d57b594544f62ffb26f9d7c8a3f23f5a832;hb=a2814ea7573bf5edd5323d6f89c48ff14105db69;hpb=97b6ffd01e16cbb0871722ee605bf02794031859

diff --git a/src/bin/lttng-sessiond/kernel-consumer.c b/src/bin/lttng-sessiond/kernel-consumer.c
index bbf50d57b..9622d3058 100644
--- a/src/bin/lttng-sessiond/kernel-consumer.c
+++ b/src/bin/lttng-sessiond/kernel-consumer.c
@@ -1,170 +1,520 @@
 /*
- * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
+ * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
  *
- * 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.
+ * SPDX-License-Identifier: GPL-2.0-only
  *
- * 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
+#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/sessiond-comm/sessiond-comm.h>
+#include <common/compat/string.h>
 
+#include "consumer.h"
+#include "health-sessiond.h"
 #include "kernel-consumer.h"
+#include "notification-thread-commands.h"
+#include "session.h"
+#include "lttng-sessiond.h"
+
+static char *create_channel_path(struct consumer_output *consumer,
+		size_t *consumer_path_offset)
+{
+	int ret;
+	char tmp_path[PATH_MAX];
+	char *pathname = NULL;
+
+	assert(consumer);
+
+	/* Get the right path name destination */
+	if (consumer->type == CONSUMER_DST_LOCAL ||
+			(consumer->type == CONSUMER_DST_NET &&
+					consumer->relay_major_version == 2 &&
+					consumer->relay_minor_version >= 11)) {
+		pathname = strdup(consumer->domain_subdir);
+		if (!pathname) {
+			PERROR("Failed to copy domain subdirectory string %s",
+					consumer->domain_subdir);
+			goto error;
+		}
+		*consumer_path_offset = strlen(consumer->domain_subdir);
+		DBG3("Kernel local consumer trace path relative to current trace chunk: \"%s\"",
+				pathname);
+	} else {
+		/* Network output, relayd < 2.11. */
+		ret = snprintf(tmp_path, sizeof(tmp_path), "%s%s",
+				consumer->dst.net.base_dir,
+				consumer->domain_subdir);
+		if (ret < 0) {
+			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->domain_subdir);
+			goto error;
+		}
+		pathname = lttng_strndup(tmp_path, sizeof(tmp_path));
+		if (!pathname) {
+			PERROR("lttng_strndup");
+			goto error;
+		}
+		*consumer_path_offset = 0;
+		DBG3("Kernel network consumer subdir path: %s", pathname);
+	}
+
+	return pathname;
+
+error:
+	free(pathname);
+	return NULL;
+}
 
 /*
- * Send all stream fds of kernel channel to the consumer.
+ * Sending a single channel to the consumer with command ADD_CHANNEL.
  */
-int kernel_consumer_send_channel_stream(struct consumer_data *consumer_data,
-		struct ltt_kernel_channel *channel, uid_t uid, gid_t gid)
+static
+int kernel_consumer_add_channel(struct consumer_socket *sock,
+		struct ltt_kernel_channel *channel,
+		struct ltt_kernel_session *ksession,
+		unsigned int monitor)
 {
-	int ret, count = 0, consumer_sock;
-	struct ltt_kernel_stream *stream;
+	int ret;
+	char *pathname = NULL;
 	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;
+	bool is_local_trace;
+	size_t consumer_path_offset = 0;
 
-	DBG("Sending streams of channel %s to kernel consumer",
-			channel->channel->name);
+	/* Safety net */
+	assert(channel);
+	assert(ksession);
+	assert(ksession->consumer);
 
-	consumer_sock = consumer_data->cmd_sock;
+	consumer = ksession->consumer;
+	channel_attr_extended = (struct lttng_channel_extended *)
+			channel->channel->attr.extended.ptr;
 
-	/* Send channel */
-	lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
-	lkm.u.channel.channel_key = channel->fd;
-	lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
-	lkm.u.channel.mmap_len = 0;	/* for kernel */
-	DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
-	ret = lttcomm_send_unix_sock(consumer_sock, &lkm, sizeof(lkm));
-	if (ret < 0) {
-		PERROR("send consumer channel");
+	DBG("Kernel consumer adding channel %s to kernel consumer",
+			channel->channel->name);
+	is_local_trace = consumer->net_seq_index == -1ULL;
+
+	pathname = create_channel_path(consumer, &consumer_path_offset);
+	if (!pathname) {
+		ret = -1;
 		goto error;
 	}
 
-	/* Send streams */
-	cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
-		if (!stream->fd) {
-			continue;
-		}
-		/* Reset consumer message structure */
-		memset(&lkm, 0, sizeof(lkm));
-		lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
-		lkm.u.stream.channel_key = channel->fd;
-		lkm.u.stream.stream_key = stream->fd;
-		lkm.u.stream.state = stream->state;
-		lkm.u.stream.output = channel->channel->attr.output;
-		lkm.u.stream.mmap_len = 0;	/* for kernel */
-		lkm.u.stream.uid = uid;
-		lkm.u.stream.gid = gid;
-		strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
-		lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
-		count++;
-
-		DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
-		ret = lttcomm_send_unix_sock(consumer_sock, &lkm, sizeof(lkm));
+	if (is_local_trace && ksession->current_trace_chunk) {
+		enum lttng_trace_chunk_status chunk_status;
+		char *pathname_index;
+
+		ret = asprintf(&pathname_index, "%s/" DEFAULT_INDEX_DIR,
+				pathname);
 		if (ret < 0) {
-			PERROR("send consumer stream");
+			ERR("Failed to format channel index directory");
+			ret = -1;
 			goto error;
 		}
-		ret = lttcomm_send_fds_unix_sock(consumer_sock, &stream->fd, 1);
-		if (ret < 0) {
-			PERROR("send consumer stream ancillary data");
+
+		/*
+		 * Create the index subdirectory which will take care
+		 * of implicitly creating the channel's path.
+		 */
+		chunk_status = lttng_trace_chunk_create_subdirectory(
+				ksession->current_trace_chunk, pathname_index);
+		free(pathname_index);
+		if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
+			ret = -1;
 			goto error;
 		}
 	}
 
-	DBG("consumer channel streams sent");
+	/* Prep channel message structure */
+	consumer_init_add_channel_comm_msg(&lkm,
+			channel->key,
+			ksession->id,
+			&pathname[consumer_path_offset],
+			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,
+			monitor,
+			channel->channel->attr.live_timer_interval,
+			ksession->is_live_session,
+			channel_attr_extended->monitor_timer_interval,
+			ksession->current_trace_chunk);
 
-	return 0;
+	health_code_update();
+
+	ret = consumer_send_channel(sock, &lkm);
+	if (ret < 0) {
+		goto error;
+	}
+
+	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;
 }
 
 /*
- * Send all stream fds of the kernel session to the consumer.
+ * 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_send_session(struct consumer_data *consumer_data,
-		struct ltt_kernel_session *session)
+int kernel_consumer_add_metadata(struct consumer_socket *sock,
+		struct ltt_kernel_session *ksession, unsigned int monitor)
+{
+	int ret;
+	struct lttcomm_consumer_msg lkm;
+	struct consumer_output *consumer;
+
+	rcu_read_lock();
+
+	/* Safety net */
+	assert(ksession);
+	assert(ksession->consumer);
+	assert(sock);
+
+	DBG("Sending metadata %d to kernel consumer",
+			ksession->metadata_stream_fd);
+
+	/* Get consumer output pointer */
+	consumer = ksession->consumer;
+
+	/* Prep channel message structure */
+	consumer_init_add_channel_comm_msg(&lkm, ksession->metadata->key,
+			ksession->id, "", ksession->uid, ksession->gid,
+			consumer->net_seq_index, DEFAULT_METADATA_NAME, 1,
+			DEFAULT_KERNEL_CHANNEL_OUTPUT,
+			CONSUMER_CHANNEL_TYPE_METADATA, 0, 0, monitor, 0,
+			ksession->is_live_session, 0,
+			ksession->current_trace_chunk);
+
+	health_code_update();
+
+	ret = consumer_send_channel(sock, &lkm);
+	if (ret < 0) {
+		goto error;
+	}
+
+	health_code_update();
+
+	/* Prep stream message structure */
+	consumer_init_add_stream_comm_msg(&lkm,
+			ksession->metadata->key,
+			ksession->metadata_stream_fd,
+			0 /* CPU: 0 for metadata. */);
+
+	health_code_update();
+
+	/* Send stream and file descriptor */
+	ret = consumer_send_stream(sock, consumer, &lkm,
+			&ksession->metadata_stream_fd, 1);
+	if (ret < 0) {
+		goto error;
+	}
+
+	health_code_update();
+
+error:
+	rcu_read_unlock();
+	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, unsigned int monitor)
+{
+	int ret;
+	struct lttcomm_consumer_msg lkm;
+	struct consumer_output *consumer;
+
+	assert(channel);
+	assert(stream);
+	assert(session);
+	assert(session->consumer);
+	assert(sock);
+
+	DBG("Sending stream %d of channel %s to kernel consumer",
+			stream->fd, channel->channel->name);
+
+	/* Get consumer output pointer */
+	consumer = session->consumer;
+
+	/* Prep stream consumer message */
+	consumer_init_add_stream_comm_msg(&lkm,
+			channel->key,
+			stream->fd,
+			stream->cpu);
+
+	health_code_update();
+
+	/* Send stream and file descriptor */
+	ret = consumer_send_stream(sock, consumer, &lkm, &stream->fd, 1);
+	if (ret < 0) {
+		goto error;
+	}
+
+	health_code_update();
+
+error:
+	return ret;
+}
+
+/*
+ * Sending the notification that all streams were sent with STREAMS_SENT.
+ */
+int kernel_consumer_streams_sent(struct consumer_socket *sock,
+		struct ltt_kernel_session *session, uint64_t channel_key)
 {
 	int ret;
-	struct ltt_kernel_channel *chan;
 	struct lttcomm_consumer_msg lkm;
-	int sock = session->consumer_fd;
+	struct consumer_output *consumer;
+
+	assert(sock);
+	assert(session);
 
-	DBG("Sending metadata stream fd");
+	DBG("Sending streams_sent");
+	/* Get consumer output pointer */
+	consumer = session->consumer;
 
-	/* Extra protection. It's NOT supposed to be set to -1 at this point */
-	if (session->consumer_fd < 0) {
-		session->consumer_fd = consumer_data->cmd_sock;
+	/* 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;
 	}
 
-	if (session->metadata_stream_fd >= 0) {
-		/* Send metadata channel fd */
-		lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
-		lkm.u.channel.channel_key = session->metadata->fd;
-		lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
-		lkm.u.channel.mmap_len = 0;	/* for kernel */
-		DBG("Sending metadata channel %d to consumer", lkm.u.channel.channel_key);
-		ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
+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;
+
+	/* Safety net */
+	assert(channel);
+	assert(ksession);
+	assert(ksession->consumer);
+	assert(sock);
+
+	rcu_read_lock();
+
+	/* Bail out if consumer is disabled */
+	if (!ksession->consumer->enabled) {
+		ret = LTTNG_OK;
+		goto error;
+	}
+
+	DBG("Sending streams of channel %s to kernel consumer",
+			channel->channel->name);
+
+	if (!channel->sent_to_consumer) {
+		ret = kernel_consumer_add_channel(sock, channel, ksession, monitor);
 		if (ret < 0) {
-			PERROR("send consumer channel");
 			goto error;
 		}
+		channel->sent_to_consumer = true;
+	}
+
+	/* Send streams */
+	cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
+		if (!stream->fd || stream->sent_to_consumer) {
+			continue;
+		}
 
-		/* Send metadata stream fd */
-		lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
-		lkm.u.stream.channel_key = session->metadata->fd;
-		lkm.u.stream.stream_key = session->metadata_stream_fd;
-		lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
-		lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
-		lkm.u.stream.mmap_len = 0;	/* for kernel */
-		lkm.u.stream.uid = session->uid;
-		lkm.u.stream.gid = session->gid;
-		strncpy(lkm.u.stream.path_name, session->metadata->pathname,
-				PATH_MAX - 1);
-		lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
-
-		DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
-		ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
+		/* Add stream on the kernel consumer side. */
+		ret = kernel_consumer_add_stream(sock, channel, stream,
+				ksession, monitor);
 		if (ret < 0) {
-			PERROR("send consumer stream");
 			goto error;
 		}
-		ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
+		stream->sent_to_consumer = true;
+	}
+
+error:
+	rcu_read_unlock();
+	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, monitor = 0;
+	struct ltt_kernel_channel *chan;
+
+	/* Safety net */
+	assert(session);
+	assert(session->consumer);
+	assert(sock);
+
+	/* Bail out if consumer is disabled */
+	if (!session->consumer->enabled) {
+		ret = LTTNG_OK;
+		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 && session->metadata) {
+		ret = kernel_consumer_add_metadata(sock, session, monitor);
 		if (ret < 0) {
-			PERROR("send consumer stream");
 			goto error;
 		}
 	}
 
+	/* Send channel and streams of it */
 	cds_list_for_each_entry(chan, &session->channel_list.head, list) {
-		ret = kernel_consumer_send_channel_stream(consumer_data, chan,
-				session->uid, session->gid);
+		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("consumer fds (metadata and channel streams) sent");
+	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;
+}