Fix: consumerd: user space metadata not regenerated
[lttng-tools.git] / src / common / consumer / consumer-stream.h
1 /*
2 * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
3 *
4 * SPDX-License-Identifier: GPL-2.0-only
5 *
6 */
7
8 #ifndef LTTNG_CONSUMER_STREAM_H
9 #define LTTNG_CONSUMER_STREAM_H
10
11 #include "consumer.h"
12
13 /*
14 * Create a consumer stream.
15 *
16 * The channel lock MUST be acquired.
17 */
18 struct lttng_consumer_stream *consumer_stream_create(
19 struct lttng_consumer_channel *channel,
20 uint64_t channel_key,
21 uint64_t stream_key,
22 const char *channel_name,
23 uint64_t relayd_id,
24 uint64_t session_id,
25 struct lttng_trace_chunk *trace_chunk,
26 int cpu,
27 int *alloc_ret,
28 enum consumer_channel_type type,
29 unsigned int monitor);
30
31 /*
32 * Close stream's file descriptors and, if needed, close stream also on the
33 * relayd side.
34 *
35 * The stream lock MUST be acquired.
36 * The consumer data lock MUST be acquired.
37 */
38 void consumer_stream_close(struct lttng_consumer_stream *stream);
39
40 /*
41 * Close stream on the relayd side. This call can destroy a relayd if the
42 * conditions are met.
43 *
44 * A RCU read side lock MUST be acquired if the relayd object was looked up in
45 * a hash table before calling this.
46 */
47 void consumer_stream_relayd_close(struct lttng_consumer_stream *stream,
48 struct consumer_relayd_sock_pair *relayd);
49
50 /*
51 * Delete the stream from all possible hash tables.
52 *
53 * The consumer data lock MUST be acquired.
54 */
55 void consumer_stream_delete(struct lttng_consumer_stream *stream,
56 struct lttng_ht *ht);
57
58 /*
59 * Free the given stream within a RCU call.
60 */
61 void consumer_stream_free(struct lttng_consumer_stream *stream);
62
63 /*
64 * Destroy a stream completely. This will delete, close and free the stream.
65 * Once return, the stream is NO longer usable. Its channel may get destroyed
66 * if conditions are met.
67 *
68 * This MUST be called WITHOUT the consumer data and stream lock acquired.
69 */
70 void consumer_stream_destroy(struct lttng_consumer_stream *stream,
71 struct lttng_ht *ht);
72
73 /*
74 * Destroy the stream's buffers on the tracer side. This is also called in a
75 * stream destroy.
76 */
77 void consumer_stream_destroy_buffers(struct lttng_consumer_stream *stream);
78
79 /*
80 * Write index of a specific stream either on the relayd or local disk.
81 */
82 int consumer_stream_write_index(struct lttng_consumer_stream *stream,
83 struct ctf_packet_index *index);
84
85 int consumer_stream_sync_metadata(struct lttng_consumer_local_data *ctx,
86 uint64_t session_id);
87
88 /*
89 * Create the output files of a local stream.
90 *
91 * This must be called with the channel's and the stream's lock held.
92 */
93 int consumer_stream_create_output_files(struct lttng_consumer_stream *stream,
94 bool create_index);
95
96 /*
97 * Rotate the output files of a local stream. This will change the
98 * active output files of both the binary and index in accordance
99 * with the stream's configuration (stream file count).
100 *
101 * This must be called with the channel's and the stream's lock held.
102 */
103 int consumer_stream_rotate_output_files(struct lttng_consumer_stream *stream);
104
105 /*
106 * Indicates whether or not a stream is logically deleted. A deleted stream
107 * should no longer be used; its existence is only garanteed by the RCU lock
108 * held by the caller.
109 *
110 * This function must be called with the RCU read side lock held.
111 */
112 bool consumer_stream_is_deleted(struct lttng_consumer_stream *stream);
113
114 /*
115 * Enable metadata bucketization. This must only be enabled if the tracer
116 * provides a reliable metadata `coherent` flag.
117 *
118 * This must be called on initialization before any subbuffer is consumed.
119 */
120 int consumer_stream_enable_metadata_bucketization(
121 struct lttng_consumer_stream *stream);
122
123 /*
124 * Set the version of a metadata stream (i.e. following a metadata
125 * regeneration).
126 *
127 * Changing the version of a metadata stream will cause any bucketized metadata
128 * to be discarded and will mark the metadata stream for future `reset`.
129 */
130 void consumer_stream_metadata_set_version(
131 struct lttng_consumer_stream *stream, uint64_t new_version);
132
133 #endif /* LTTNG_CONSUMER_STREAM_H */
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