X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Fconsumer%2Fconsumer-stream.c;h=398d71ae05f92f6d9c0437b4fb203532870eb5d6;hp=ca2c4536cb78f99758ba1a8ec2e2b81fead12f4f;hb=f96af312b7d09d834f9d13408654ada93320ae2a;hpb=9276e5c88e693249bd31197baecf58310df8167e diff --git a/src/common/consumer/consumer-stream.c b/src/common/consumer/consumer-stream.c index ca2c4536c..398d71ae0 100644 --- a/src/common/consumer/consumer-stream.c +++ b/src/common/consumer/consumer-stream.c @@ -1,20 +1,10 @@ /* - * Copyright (C) 2011 - Julien Desfossez - * Mathieu Desnoyers - * Copyright (C) 2013 - David Goulet + * Copyright (C) 2011 Julien Desfossez + * Copyright (C) 2011 Mathieu Desnoyers + * 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. + * 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 _LGPL_SOURCE @@ -29,6 +19,9 @@ #include #include #include +#include +#include +#include #include "consumer-stream.h" @@ -46,6 +39,516 @@ static void free_stream_rcu(struct rcu_head *head) free(stream); } +static void consumer_stream_data_lock_all(struct lttng_consumer_stream *stream) +{ + pthread_mutex_lock(&stream->chan->lock); + pthread_mutex_lock(&stream->lock); +} + +static void consumer_stream_data_unlock_all(struct lttng_consumer_stream *stream) +{ + pthread_mutex_unlock(&stream->lock); + pthread_mutex_unlock(&stream->chan->lock); +} + +static void consumer_stream_metadata_lock_all(struct lttng_consumer_stream *stream) +{ + consumer_stream_data_lock_all(stream); + pthread_mutex_lock(&stream->metadata_rdv_lock); +} + +static void consumer_stream_metadata_unlock_all(struct lttng_consumer_stream *stream) +{ + pthread_mutex_unlock(&stream->metadata_rdv_lock); + consumer_stream_data_unlock_all(stream); +} + +/* Only used for data streams. */ +static int consumer_stream_update_stats(struct lttng_consumer_stream *stream, + const struct stream_subbuffer *subbuf) +{ + int ret = 0; + uint64_t sequence_number; + const uint64_t discarded_events = subbuf->info.data.events_discarded; + + if (!subbuf->info.data.sequence_number.is_set) { + /* Command not supported by the tracer. */ + sequence_number = -1ULL; + stream->sequence_number_unavailable = true; + } else { + sequence_number = subbuf->info.data.sequence_number.value; + } + + /* + * Start the sequence when we extract the first packet in case we don't + * start at 0 (for example if a consumer is not connected to the + * session immediately after the beginning). + */ + if (stream->last_sequence_number == -1ULL) { + stream->last_sequence_number = sequence_number; + } else if (sequence_number > stream->last_sequence_number) { + stream->chan->lost_packets += sequence_number - + stream->last_sequence_number - 1; + } else { + /* seq <= last_sequence_number */ + ERR("Sequence number inconsistent : prev = %" PRIu64 + ", current = %" PRIu64, + stream->last_sequence_number, sequence_number); + ret = -1; + goto end; + } + stream->last_sequence_number = sequence_number; + + if (discarded_events < stream->last_discarded_events) { + /* + * Overflow has occurred. We assume only one wrap-around + * has occurred. + */ + stream->chan->discarded_events += + (1ULL << (CAA_BITS_PER_LONG - 1)) - + stream->last_discarded_events + + discarded_events; + } else { + stream->chan->discarded_events += discarded_events - + stream->last_discarded_events; + } + stream->last_discarded_events = discarded_events; + ret = 0; + +end: + return ret; +} + +static +void ctf_packet_index_populate(struct ctf_packet_index *index, + off_t offset, const struct stream_subbuffer *subbuffer) +{ + *index = (typeof(*index)){ + .offset = htobe64(offset), + .packet_size = htobe64(subbuffer->info.data.packet_size), + .content_size = htobe64(subbuffer->info.data.content_size), + .timestamp_begin = htobe64( + subbuffer->info.data.timestamp_begin), + .timestamp_end = htobe64( + subbuffer->info.data.timestamp_end), + .events_discarded = htobe64( + subbuffer->info.data.events_discarded), + .stream_id = htobe64(subbuffer->info.data.stream_id), + .stream_instance_id = htobe64( + subbuffer->info.data.stream_instance_id.is_set ? + subbuffer->info.data.stream_instance_id.value : -1ULL), + .packet_seq_num = htobe64( + subbuffer->info.data.sequence_number.is_set ? + subbuffer->info.data.sequence_number.value : -1ULL), + }; +} + +static ssize_t consumer_stream_consume_mmap( + struct lttng_consumer_local_data *ctx, + struct lttng_consumer_stream *stream, + const struct stream_subbuffer *subbuffer) +{ + const unsigned long padding_size = + subbuffer->info.data.padded_subbuf_size - + subbuffer->info.data.subbuf_size; + + return lttng_consumer_on_read_subbuffer_mmap( + stream, &subbuffer->buffer.buffer, padding_size); +} + +static ssize_t consumer_stream_consume_splice( + struct lttng_consumer_local_data *ctx, + struct lttng_consumer_stream *stream, + const struct stream_subbuffer *subbuffer) +{ + return lttng_consumer_on_read_subbuffer_splice(ctx, stream, + subbuffer->info.data.padded_subbuf_size, 0); +} + +static int consumer_stream_send_index( + struct lttng_consumer_stream *stream, + const struct stream_subbuffer *subbuffer, + struct lttng_consumer_local_data *ctx) +{ + off_t packet_offset = 0; + struct ctf_packet_index index = {}; + + /* + * This is called after consuming the sub-buffer; substract the + * effect this sub-buffer from the offset. + */ + if (stream->net_seq_idx == (uint64_t) -1ULL) { + packet_offset = stream->out_fd_offset - + subbuffer->info.data.padded_subbuf_size; + } + + ctf_packet_index_populate(&index, packet_offset, subbuffer); + return consumer_stream_write_index(stream, &index); +} + +/* + * Actually do the metadata sync using the given metadata stream. + * + * Return 0 on success else a negative value. ENODATA can be returned also + * indicating that there is no metadata available for that stream. + */ +static int do_sync_metadata(struct lttng_consumer_stream *metadata, + struct lttng_consumer_local_data *ctx) +{ + int ret; + enum sync_metadata_status status; + + assert(metadata); + assert(metadata->metadata_flag); + assert(ctx); + + /* + * In UST, since we have to write the metadata from the cache packet + * by packet, we might need to start this procedure multiple times + * until all the metadata from the cache has been extracted. + */ + do { + /* + * Steps : + * - Lock the metadata stream + * - Check if metadata stream node was deleted before locking. + * - if yes, release and return success + * - Check if new metadata is ready (flush + snapshot pos) + * - If nothing : release and return. + * - Lock the metadata_rdv_lock + * - Unlock the metadata stream + * - cond_wait on metadata_rdv to wait the wakeup from the + * metadata thread + * - Unlock the metadata_rdv_lock + */ + pthread_mutex_lock(&metadata->lock); + + /* + * There is a possibility that we were able to acquire a reference on the + * stream from the RCU hash table but between then and now, the node might + * have been deleted just before the lock is acquired. Thus, after locking, + * we make sure the metadata node has not been deleted which means that the + * buffers are closed. + * + * In that case, there is no need to sync the metadata hence returning a + * success return code. + */ + ret = cds_lfht_is_node_deleted(&metadata->node.node); + if (ret) { + ret = 0; + goto end_unlock_mutex; + } + + switch (ctx->type) { + case LTTNG_CONSUMER_KERNEL: + /* + * Empty the metadata cache and flush the current stream. + */ + status = lttng_kconsumer_sync_metadata(metadata); + break; + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + /* + * Ask the sessiond if we have new metadata waiting and update the + * consumer metadata cache. + */ + status = lttng_ustconsumer_sync_metadata(ctx, metadata); + break; + default: + abort(); + } + + switch (status) { + case SYNC_METADATA_STATUS_NEW_DATA: + break; + case SYNC_METADATA_STATUS_NO_DATA: + ret = 0; + goto end_unlock_mutex; + case SYNC_METADATA_STATUS_ERROR: + ret = -1; + goto end_unlock_mutex; + default: + abort(); + } + + /* + * At this point, new metadata have been flushed, so we wait on the + * rendez-vous point for the metadata thread to wake us up when it + * finishes consuming the metadata and continue execution. + */ + + pthread_mutex_lock(&metadata->metadata_rdv_lock); + + /* + * Release metadata stream lock so the metadata thread can process it. + */ + pthread_mutex_unlock(&metadata->lock); + + /* + * Wait on the rendez-vous point. Once woken up, it means the metadata was + * consumed and thus synchronization is achieved. + */ + pthread_cond_wait(&metadata->metadata_rdv, &metadata->metadata_rdv_lock); + pthread_mutex_unlock(&metadata->metadata_rdv_lock); + } while (status == SYNC_METADATA_STATUS_NEW_DATA); + + /* Success */ + return 0; + +end_unlock_mutex: + pthread_mutex_unlock(&metadata->lock); + return ret; +} + +/* + * Synchronize the metadata using a given session ID. A successful acquisition + * of a metadata stream will trigger a request to the session daemon and a + * snapshot so the metadata thread can consume it. + * + * This function call is a rendez-vous point between the metadata thread and + * the data thread. + * + * Return 0 on success or else a negative value. + */ +int consumer_stream_sync_metadata(struct lttng_consumer_local_data *ctx, + uint64_t session_id) +{ + int ret; + struct lttng_consumer_stream *stream = NULL; + struct lttng_ht_iter iter; + struct lttng_ht *ht; + + assert(ctx); + + /* Ease our life a bit. */ + ht = consumer_data.stream_list_ht; + + rcu_read_lock(); + + /* Search the metadata associated with the session id of the given stream. */ + + cds_lfht_for_each_entry_duplicate(ht->ht, + ht->hash_fct(&session_id, lttng_ht_seed), ht->match_fct, + &session_id, &iter.iter, stream, node_session_id.node) { + if (!stream->metadata_flag) { + continue; + } + + ret = do_sync_metadata(stream, ctx); + if (ret < 0) { + goto end; + } + } + + /* + * Force return code to 0 (success) since ret might be ENODATA for instance + * which is not an error but rather that we should come back. + */ + ret = 0; + +end: + rcu_read_unlock(); + return ret; +} + +static int consumer_stream_sync_metadata_index( + struct lttng_consumer_stream *stream, + const struct stream_subbuffer *subbuffer, + struct lttng_consumer_local_data *ctx) +{ + int ret; + + /* Block until all the metadata is sent. */ + pthread_mutex_lock(&stream->metadata_timer_lock); + assert(!stream->missed_metadata_flush); + stream->waiting_on_metadata = true; + pthread_mutex_unlock(&stream->metadata_timer_lock); + + ret = consumer_stream_sync_metadata(ctx, stream->session_id); + + pthread_mutex_lock(&stream->metadata_timer_lock); + stream->waiting_on_metadata = false; + if (stream->missed_metadata_flush) { + stream->missed_metadata_flush = false; + pthread_mutex_unlock(&stream->metadata_timer_lock); + (void) stream->read_subbuffer_ops.send_live_beacon(stream); + } else { + pthread_mutex_unlock(&stream->metadata_timer_lock); + } + if (ret < 0) { + goto end; + } + + ret = consumer_stream_send_index(stream, subbuffer, ctx); +end: + return ret; +} + +/* + * Check if the local version of the metadata stream matches with the version + * of the metadata stream in the kernel. If it was updated, set the reset flag + * on the stream. + */ +static +int metadata_stream_check_version(struct lttng_consumer_stream *stream, + const struct stream_subbuffer *subbuffer) +{ + if (stream->metadata_version == subbuffer->info.metadata.version) { + goto end; + } + + DBG("New metadata version detected"); + consumer_stream_metadata_set_version(stream, + subbuffer->info.metadata.version); + + if (stream->read_subbuffer_ops.reset_metadata) { + stream->read_subbuffer_ops.reset_metadata(stream); + } + +end: + return 0; +} + +struct lttng_consumer_stream *consumer_stream_create( + struct lttng_consumer_channel *channel, + uint64_t channel_key, + uint64_t stream_key, + const char *channel_name, + uint64_t relayd_id, + uint64_t session_id, + struct lttng_trace_chunk *trace_chunk, + int cpu, + int *alloc_ret, + enum consumer_channel_type type, + unsigned int monitor) +{ + int ret; + struct lttng_consumer_stream *stream; + + stream = zmalloc(sizeof(*stream)); + if (stream == NULL) { + PERROR("malloc struct lttng_consumer_stream"); + ret = -ENOMEM; + goto end; + } + + if (trace_chunk && !lttng_trace_chunk_get(trace_chunk)) { + ERR("Failed to acquire trace chunk reference during the creation of a stream"); + ret = -1; + goto error; + } + + rcu_read_lock(); + stream->chan = channel; + stream->key = stream_key; + stream->trace_chunk = trace_chunk; + stream->out_fd = -1; + stream->out_fd_offset = 0; + stream->output_written = 0; + stream->net_seq_idx = relayd_id; + stream->session_id = session_id; + stream->monitor = monitor; + stream->endpoint_status = CONSUMER_ENDPOINT_ACTIVE; + stream->index_file = NULL; + stream->last_sequence_number = -1ULL; + stream->rotate_position = -1ULL; + /* Buffer is created with an open packet. */ + stream->opened_packet_in_current_trace_chunk = true; + pthread_mutex_init(&stream->lock, NULL); + pthread_mutex_init(&stream->metadata_timer_lock, NULL); + + /* If channel is the metadata, flag this stream as metadata. */ + if (type == CONSUMER_CHANNEL_TYPE_METADATA) { + stream->metadata_flag = 1; + /* Metadata is flat out. */ + strncpy(stream->name, DEFAULT_METADATA_NAME, sizeof(stream->name)); + /* Live rendez-vous point. */ + pthread_cond_init(&stream->metadata_rdv, NULL); + pthread_mutex_init(&stream->metadata_rdv_lock, NULL); + } else { + /* Format stream name to _ */ + ret = snprintf(stream->name, sizeof(stream->name), "%s_%d", + channel_name, cpu); + if (ret < 0) { + PERROR("snprintf stream name"); + goto error; + } + } + + switch (channel->output) { + case CONSUMER_CHANNEL_SPLICE: + stream->output = LTTNG_EVENT_SPLICE; + ret = utils_create_pipe(stream->splice_pipe); + if (ret < 0) { + goto error; + } + break; + case CONSUMER_CHANNEL_MMAP: + stream->output = LTTNG_EVENT_MMAP; + break; + default: + abort(); + } + + /* Key is always the wait_fd for streams. */ + lttng_ht_node_init_u64(&stream->node, stream->key); + + /* Init node per channel id key */ + lttng_ht_node_init_u64(&stream->node_channel_id, channel_key); + + /* Init session id node with the stream session id */ + lttng_ht_node_init_u64(&stream->node_session_id, stream->session_id); + + DBG3("Allocated stream %s (key %" PRIu64 ", chan_key %" PRIu64 + " relayd_id %" PRIu64 ", session_id %" PRIu64, + stream->name, stream->key, channel_key, + stream->net_seq_idx, stream->session_id); + + rcu_read_unlock(); + + if (type == CONSUMER_CHANNEL_TYPE_METADATA) { + stream->read_subbuffer_ops.lock = + consumer_stream_metadata_lock_all; + stream->read_subbuffer_ops.unlock = + consumer_stream_metadata_unlock_all; + stream->read_subbuffer_ops.pre_consume_subbuffer = + metadata_stream_check_version; + } else { + stream->read_subbuffer_ops.lock = consumer_stream_data_lock_all; + stream->read_subbuffer_ops.unlock = + consumer_stream_data_unlock_all; + stream->read_subbuffer_ops.pre_consume_subbuffer = + consumer_stream_update_stats; + if (channel->is_live) { + stream->read_subbuffer_ops.post_consume = + consumer_stream_sync_metadata_index; + } else { + stream->read_subbuffer_ops.post_consume = + consumer_stream_send_index; + } + } + + if (channel->output == CONSUMER_CHANNEL_MMAP) { + stream->read_subbuffer_ops.consume_subbuffer = + consumer_stream_consume_mmap; + } else { + stream->read_subbuffer_ops.consume_subbuffer = + consumer_stream_consume_splice; + } + + return stream; + +error: + rcu_read_unlock(); + lttng_trace_chunk_put(stream->trace_chunk); + free(stream); +end: + if (alloc_ret) { + *alloc_ret = ret; + } + return NULL; +} + /* * Close stream on the relayd side. This call can destroy a relayd if the * conditions are met. @@ -164,6 +667,9 @@ void consumer_stream_close(struct lttng_consumer_stream *stream) stream->index_file = NULL; } + lttng_trace_chunk_put(stream->trace_chunk); + stream->trace_chunk = NULL; + /* Check and cleanup relayd if needed. */ rcu_read_lock(); relayd = consumer_find_relayd(stream->net_seq_idx); @@ -228,6 +734,7 @@ void consumer_stream_free(struct lttng_consumer_stream *stream) { assert(stream); + metadata_bucket_destroy(stream->metadata_bucket); call_rcu(&stream->node.head, free_stream_rcu); } @@ -343,6 +850,8 @@ void consumer_stream_destroy(struct lttng_consumer_stream *stream, } /* Free stream within a RCU call. */ + lttng_trace_chunk_put(stream->trace_chunk); + stream->trace_chunk = NULL; consumer_stream_free(stream); } @@ -398,161 +907,164 @@ error: return ret; } -/* - * Actually do the metadata sync using the given metadata stream. - * - * Return 0 on success else a negative value. ENODATA can be returned also - * indicating that there is no metadata available for that stream. - */ -static int do_sync_metadata(struct lttng_consumer_stream *metadata, - struct lttng_consumer_local_data *ctx) +int consumer_stream_create_output_files(struct lttng_consumer_stream *stream, + bool create_index) { int ret; + enum lttng_trace_chunk_status chunk_status; + const int flags = O_WRONLY | O_CREAT | O_TRUNC; + const mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP; + char stream_path[LTTNG_PATH_MAX]; + + ASSERT_LOCKED(stream->lock); + assert(stream->trace_chunk); + + ret = utils_stream_file_path(stream->chan->pathname, stream->name, + stream->chan->tracefile_size, + stream->tracefile_count_current, NULL, + stream_path, sizeof(stream_path)); + if (ret < 0) { + goto end; + } - assert(metadata); - assert(metadata->metadata_flag); - assert(ctx); - - /* - * In UST, since we have to write the metadata from the cache packet - * by packet, we might need to start this procedure multiple times - * until all the metadata from the cache has been extracted. - */ - do { - /* - * Steps : - * - Lock the metadata stream - * - Check if metadata stream node was deleted before locking. - * - if yes, release and return success - * - Check if new metadata is ready (flush + snapshot pos) - * - If nothing : release and return. - * - Lock the metadata_rdv_lock - * - Unlock the metadata stream - * - cond_wait on metadata_rdv to wait the wakeup from the - * metadata thread - * - Unlock the metadata_rdv_lock - */ - pthread_mutex_lock(&metadata->lock); - - /* - * There is a possibility that we were able to acquire a reference on the - * stream from the RCU hash table but between then and now, the node might - * have been deleted just before the lock is acquired. Thus, after locking, - * we make sure the metadata node has not been deleted which means that the - * buffers are closed. - * - * In that case, there is no need to sync the metadata hence returning a - * success return code. - */ - ret = cds_lfht_is_node_deleted(&metadata->node.node); - if (ret) { - ret = 0; - goto end_unlock_mutex; + if (stream->out_fd >= 0) { + ret = close(stream->out_fd); + if (ret < 0) { + PERROR("Failed to close stream file \"%s\"", + stream->name); + goto end; } - - switch (ctx->type) { - case LTTNG_CONSUMER_KERNEL: - /* - * Empty the metadata cache and flush the current stream. - */ - ret = lttng_kconsumer_sync_metadata(metadata); - break; - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - /* - * Ask the sessiond if we have new metadata waiting and update the - * consumer metadata cache. - */ - ret = lttng_ustconsumer_sync_metadata(ctx, metadata); - break; - default: - assert(0); - ret = -1; - break; + stream->out_fd = -1; + } + + DBG("Opening stream output file \"%s\"", stream_path); + chunk_status = lttng_trace_chunk_open_file(stream->trace_chunk, stream_path, + flags, mode, &stream->out_fd, false); + if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { + ERR("Failed to open stream file \"%s\"", stream->name); + ret = -1; + goto end; + } + + if (!stream->metadata_flag && (create_index || stream->index_file)) { + if (stream->index_file) { + lttng_index_file_put(stream->index_file); } - /* - * Error or no new metadata, we exit here. - */ - if (ret <= 0 || ret == ENODATA) { - goto end_unlock_mutex; + chunk_status = lttng_index_file_create_from_trace_chunk( + stream->trace_chunk, + stream->chan->pathname, + stream->name, + stream->chan->tracefile_size, + stream->tracefile_count_current, + CTF_INDEX_MAJOR, CTF_INDEX_MINOR, + false, &stream->index_file); + if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { + ret = -1; + goto end; } + } - /* - * At this point, new metadata have been flushed, so we wait on the - * rendez-vous point for the metadata thread to wake us up when it - * finishes consuming the metadata and continue execution. - */ - - pthread_mutex_lock(&metadata->metadata_rdv_lock); + /* Reset current size because we just perform a rotation. */ + stream->tracefile_size_current = 0; + stream->out_fd_offset = 0; +end: + return ret; +} - /* - * Release metadata stream lock so the metadata thread can process it. - */ - pthread_mutex_unlock(&metadata->lock); +int consumer_stream_rotate_output_files(struct lttng_consumer_stream *stream) +{ + int ret; - /* - * Wait on the rendez-vous point. Once woken up, it means the metadata was - * consumed and thus synchronization is achieved. - */ - pthread_cond_wait(&metadata->metadata_rdv, &metadata->metadata_rdv_lock); - pthread_mutex_unlock(&metadata->metadata_rdv_lock); - } while (ret == EAGAIN); + stream->tracefile_count_current++; + if (stream->chan->tracefile_count > 0) { + stream->tracefile_count_current %= + stream->chan->tracefile_count; + } - /* Success */ - return 0; + DBG("Rotating output files of stream \"%s\"", stream->name); + ret = consumer_stream_create_output_files(stream, true); + if (ret) { + goto end; + } -end_unlock_mutex: - pthread_mutex_unlock(&metadata->lock); +end: return ret; } -/* - * Synchronize the metadata using a given session ID. A successful acquisition - * of a metadata stream will trigger a request to the session daemon and a - * snapshot so the metadata thread can consume it. - * - * This function call is a rendez-vous point between the metadata thread and - * the data thread. - * - * Return 0 on success or else a negative value. - */ -int consumer_stream_sync_metadata(struct lttng_consumer_local_data *ctx, - uint64_t session_id) +bool consumer_stream_is_deleted(struct lttng_consumer_stream *stream) { - int ret; - struct lttng_consumer_stream *stream = NULL; - struct lttng_ht_iter iter; - struct lttng_ht *ht; + /* + * This function does not take a const stream since + * cds_lfht_is_node_deleted was not const before liburcu 0.12. + */ + assert(stream); + return cds_lfht_is_node_deleted(&stream->node.node); +} - assert(ctx); +static ssize_t metadata_bucket_flush( + const struct stream_subbuffer *buffer, void *data) +{ + ssize_t ret; + struct lttng_consumer_stream *stream = data; - /* Ease our life a bit. */ - ht = consumer_data.stream_list_ht; + ret = consumer_stream_consume_mmap(NULL, stream, buffer); + if (ret < 0) { + goto end; + } +end: + return ret; +} - rcu_read_lock(); +static ssize_t metadata_bucket_consume( + struct lttng_consumer_local_data *unused, + struct lttng_consumer_stream *stream, + const struct stream_subbuffer *subbuffer) +{ + ssize_t ret; + enum metadata_bucket_status status; + + status = metadata_bucket_fill(stream->metadata_bucket, subbuffer); + switch (status) { + case METADATA_BUCKET_STATUS_OK: + /* Return consumed size. */ + ret = subbuffer->buffer.buffer.size; + break; + default: + ret = -1; + } - /* Search the metadata associated with the session id of the given stream. */ + return ret; +} - cds_lfht_for_each_entry_duplicate(ht->ht, - ht->hash_fct(&session_id, lttng_ht_seed), ht->match_fct, - &session_id, &iter.iter, stream, node_session_id.node) { - if (!stream->metadata_flag) { - continue; - } +int consumer_stream_enable_metadata_bucketization( + struct lttng_consumer_stream *stream) +{ + int ret = 0; - ret = do_sync_metadata(stream, ctx); - if (ret < 0) { - goto end; - } - } + assert(stream->metadata_flag); + assert(!stream->metadata_bucket); + assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); - /* - * Force return code to 0 (success) since ret might be ENODATA for instance - * which is not an error but rather that we should come back. - */ - ret = 0; + stream->metadata_bucket = metadata_bucket_create( + metadata_bucket_flush, stream); + if (!stream->metadata_bucket) { + ret = -1; + goto end; + } + stream->read_subbuffer_ops.consume_subbuffer = metadata_bucket_consume; end: - rcu_read_unlock(); return ret; } + +void consumer_stream_metadata_set_version( + struct lttng_consumer_stream *stream, uint64_t new_version) +{ + assert(new_version > stream->metadata_version); + stream->metadata_version = new_version; + stream->reset_metadata_flag = 1; + + if (stream->metadata_bucket) { + metadata_bucket_reset(stream->metadata_bucket); + } +}