sessiond: implement consumer clear channel

[lttng-tools.git] / src / bin / lttng-sessiond / consumer.c

diff --git a/src/bin/lttng-sessiond/consumer.c b/src/bin/lttng-sessiond/consumer.c
index d376c9ee3cc31ff7817d9a99146f88fd8e806c45..e745702f85cd9cea776a1063d7dea6025849bd4a 100644 (file)
--- a/src/bin/lttng-sessiond/consumer.c
+++ b/src/bin/lttng-sessiond/consumer.c
@@ -46,7 +46,7 @@
  * returned.
  */
 char *setup_channel_trace_path(struct consumer_output *consumer,
-               const char *session_path)
+               const char *session_path, size_t *consumer_path_offset)
 {
        int ret;
        char *pathname;
@@ -69,13 +69,15 @@ char *setup_channel_trace_path(struct consumer_output *consumer,
        if (consumer->type == CONSUMER_DST_NET &&
                        consumer->relay_major_version == 2 &&
                        consumer->relay_minor_version < 11) {
-               ret = snprintf(pathname, LTTNG_PATH_MAX, "%s%s/%s%s",
+               ret = snprintf(pathname, LTTNG_PATH_MAX, "%s%s/%s/%s",
                                consumer->dst.net.base_dir,
                                consumer->chunk_path, consumer->domain_subdir,
                                session_path);
+               *consumer_path_offset = 0;
        } else {
-               ret = snprintf(pathname, LTTNG_PATH_MAX, "%s%s",
+               ret = snprintf(pathname, LTTNG_PATH_MAX, "%s/%s",
                                consumer->domain_subdir, session_path);
+               *consumer_path_offset = strlen(consumer->domain_subdir) + 1;
        }
        DBG3("Consumer trace path relative to current trace chunk: \"%s\"",
                        pathname);
@@ -624,6 +626,7 @@ struct consumer_output *consumer_copy_output(struct consumer_output *src)
        output->snapshot = src->snapshot;
        output->relay_major_version = src->relay_major_version;
        output->relay_minor_version = src->relay_minor_version;
+       output->relay_allows_clear = src->relay_allows_clear;
        memcpy(&output->dst, &src->dst, sizeof(output->dst));
        ret = consumer_copy_sockets(output, src);
        if (ret < 0) {
@@ -1724,6 +1727,34 @@ error:
        return ret;
 }
 
+int consumer_clear_channel(struct consumer_socket *socket, uint64_t key)
+{
+       int ret;
+       struct lttcomm_consumer_msg msg;
+
+       assert(socket);
+
+       DBG("Consumer clear channel %" PRIu64, key);
+
+       memset(&msg, 0, sizeof(msg));
+       msg.cmd_type = LTTNG_CONSUMER_CLEAR_CHANNEL;
+       msg.u.clear_channel.key = key;
+
+       health_code_update();
+
+       pthread_mutex_lock(socket->lock);
+       ret = consumer_send_msg(socket, &msg);
+       if (ret < 0) {
+               goto error_socket;
+       }
+
+error_socket:
+       pthread_mutex_unlock(socket->lock);
+
+       health_code_update();
+       return ret;
+}
+
 int consumer_init(struct consumer_socket *socket,
                const lttng_uuid sessiond_uuid)
 {
@@ -1755,13 +1786,15 @@ error:
  */
 int consumer_create_trace_chunk(struct consumer_socket *socket,
                uint64_t relayd_id, uint64_t session_id,
-               struct lttng_trace_chunk *chunk)
+               struct lttng_trace_chunk *chunk,
+               const char *domain_subdir)
 {
        int ret;
        enum lttng_trace_chunk_status chunk_status;
        struct lttng_credentials chunk_credentials;
-       const struct lttng_directory_handle *chunk_directory_handle;
-       int chunk_dirfd;
+       const struct lttng_directory_handle *chunk_directory_handle = NULL;
+       struct lttng_directory_handle *domain_handle = NULL;
+       int domain_dirfd;
        const char *chunk_name;
        bool chunk_name_overridden;
        uint64_t chunk_id;
@@ -1830,25 +1863,12 @@ int consumer_create_trace_chunk(struct consumer_socket *socket,
        msg.u.create_trace_chunk.chunk_id = chunk_id;
 
        if (chunk_has_local_output) {
-               chunk_status = lttng_trace_chunk_get_chunk_directory_handle(
+               chunk_status = lttng_trace_chunk_borrow_chunk_directory_handle(
                                chunk, &chunk_directory_handle);
                if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
                        ret = -LTTNG_ERR_FATAL;
                        goto error;
                }
-
-               /*
-                * This will only compile on platforms that support
-                * dirfd (POSIX.2008). This is fine as the session daemon
-                * is only built for such platforms.
-                *
-                * The ownership of the chunk directory handle's is maintained
-                * by the trace chunk.
-                */
-               chunk_dirfd = lttng_directory_handle_get_dirfd(
-                               chunk_directory_handle);
-               assert(chunk_dirfd >= 0);
-
                chunk_status = lttng_trace_chunk_get_credentials(
                                chunk, &chunk_credentials);
                if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
@@ -1859,6 +1879,37 @@ int consumer_create_trace_chunk(struct consumer_socket *socket,
                        ret = -LTTNG_ERR_FATAL;
                        goto error;
                }
+               ret = lttng_directory_handle_create_subdirectory_as_user(
+                               chunk_directory_handle,
+                               domain_subdir,
+                               S_IRWXU | S_IRWXG,
+                               &chunk_credentials);
+               if (ret) {
+                       PERROR("Failed to create chunk domain output directory \"%s\"",
+                               domain_subdir);
+                       ret = -LTTNG_ERR_FATAL;
+                       goto error;
+               }
+               domain_handle = lttng_directory_handle_create_from_handle(
+                               domain_subdir,
+                               chunk_directory_handle);
+               if (!domain_handle) {
+                       ret = -LTTNG_ERR_FATAL;
+                       goto error;
+               }
+
+               /*
+                * This will only compile on platforms that support
+                * dirfd (POSIX.2008). This is fine as the session daemon
+                * is only built for such platforms.
+                *
+                * The ownership of the chunk directory handle's is maintained
+                * by the trace chunk.
+                */
+               domain_dirfd = lttng_directory_handle_get_dirfd(
+                               domain_handle);
+               assert(domain_dirfd >= 0);
+
                msg.u.create_trace_chunk.credentials.value.uid =
                                chunk_credentials.uid;
                msg.u.create_trace_chunk.credentials.value.gid =
@@ -1881,9 +1932,9 @@ int consumer_create_trace_chunk(struct consumer_socket *socket,
        }
 
        if (chunk_has_local_output) {
-               DBG("Sending trace chunk directory fd to consumer");
+               DBG("Sending trace chunk domain directory fd to consumer");
                health_code_update();
-               ret = consumer_send_fds(socket, &chunk_dirfd, 1);
+               ret = consumer_send_fds(socket, &domain_dirfd, 1);
                health_code_update();
                if (ret < 0) {
                        ERR("Trace chunk creation error on consumer");
@@ -1892,6 +1943,7 @@ int consumer_create_trace_chunk(struct consumer_socket *socket,
                }
        }
 error:
+       lttng_directory_handle_put(domain_handle);
        return ret;
 }