Rename C++ header files to .hpp

[lttng-tools.git] / src / common / trace-chunk.cpp

diff --git a/src/common/trace-chunk.cpp b/src/common/trace-chunk.cpp
index eed3d558b0181d269501fb485e7ec63298a8f8d5..2bf1a39623d4ac6700ac48f99bdea254786a1dc1 100644 (file)
--- a/src/common/trace-chunk.cpp
+++ b/src/common/trace-chunk.cpp
@@ -5,23 +5,23 @@
  *
  */
 
-#include <common/compat/directory-handle.h>
-#include <common/credentials.h>
-#include <common/defaults.h>
-#include <common/dynamic-array.h>
-#include <common/error.h>
-#include <common/fd-tracker/fd-tracker.h>
-#include <common/fd-tracker/utils.h>
-#include <common/fs-handle.h>
-#include <common/fs-handle-internal.h>
-#include <common/hashtable/hashtable.h>
-#include <common/hashtable/utils.h>
-#include <common/optional.h>
-#include <common/string-utils/format.h>
-#include <common/time.h>
-#include <common/trace-chunk-registry.h>
-#include <common/trace-chunk.h>
-#include <common/utils.h>
+#include <common/compat/directory-handle.hpp>
+#include <common/credentials.hpp>
+#include <common/defaults.hpp>
+#include <common/dynamic-array.hpp>
+#include <common/error.hpp>
+#include <common/fd-tracker/fd-tracker.hpp>
+#include <common/fd-tracker/utils.hpp>
+#include <common/fs-handle.hpp>
+#include <common/fs-handle-internal.hpp>
+#include <common/hashtable/hashtable.hpp>
+#include <common/hashtable/utils.hpp>
+#include <common/optional.hpp>
+#include <common/string-utils/format.hpp>
+#include <common/time.hpp>
+#include <common/trace-chunk-registry.hpp>
+#include <common/trace-chunk.hpp>
+#include <common/utils.hpp>
 #include <lttng/constant.h>
 
 #include <inttypes.h>
@@ -171,7 +171,7 @@ const char *lttng_trace_chunk_command_type_str(
 };
 
 static
-const chunk_command close_command_get_post_release_func(
+chunk_command close_command_get_post_release_func(
                lttng_trace_chunk_command_type type) {
        switch (type) {
        case LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED:
@@ -238,7 +238,7 @@ int fs_handle_untracked_get_fd(struct fs_handle *_handle)
 }
 
 static
-void fs_handle_untracked_put_fd(struct fs_handle *_handle)
+void fs_handle_untracked_put_fd(struct fs_handle *_handle __attribute__((unused)))
 {
        /* no-op. */
 }
@@ -1007,6 +1007,7 @@ enum lttng_trace_chunk_status lttng_trace_chunk_set_credentials_current_user(
        enum lttng_trace_chunk_status status = LTTNG_TRACE_CHUNK_STATUS_OK;
        const struct chunk_credentials credentials = {
                .use_current_user = true,
+               .user = {},
        };
 
        pthread_mutex_lock(&chunk->lock);
@@ -1639,7 +1640,7 @@ end:
 }
 
 static
-int lttng_trace_chunk_no_operation(struct lttng_trace_chunk *trace_chunk)
+int lttng_trace_chunk_no_operation(struct lttng_trace_chunk *trace_chunk __attribute__((unused)))
 {
        return 0;
 }
@@ -1857,7 +1858,6 @@ void free_lttng_trace_chunk_registry_element(struct rcu_head *node)
        struct lttng_trace_chunk_registry_element *element =
                        container_of(node, typeof(*element), rcu_node);
 
-       lttng_trace_chunk_fini(&element->chunk);
        free(element);
 }
 
@@ -1879,6 +1879,24 @@ void lttng_trace_chunk_release(struct urcu_ref *ref)
        if (chunk->in_registry_element) {
                struct lttng_trace_chunk_registry_element *element;
 
+               /*
+                * Release internal chunk attributes immediately and
+                * only use the deferred `call_rcu` work to reclaim the
+                * storage.
+                *
+                * This ensures that file handles are released as soon as
+                * possible which works around a problem we encounter with PRAM fs
+                * mounts (and possibly other non-POSIX compliant file systems):
+                * directories that contain files which are open can't be
+                * rmdir().
+                *
+                * This means that the recording of a snapshot could be
+                * completed, but that it would be impossible for the user to
+                * delete it until the deferred clean-up released the file
+                * handles to its contents.
+                */
+               lttng_trace_chunk_fini(chunk);
+
                element = container_of(chunk, typeof(*element), chunk);
                if (element->registry) {
                        rcu_read_lock();
@@ -1984,7 +2002,20 @@ end:
 struct lttng_trace_chunk *
 lttng_trace_chunk_registry_publish_chunk(
                struct lttng_trace_chunk_registry *registry,
-               uint64_t session_id, struct lttng_trace_chunk *chunk)
+               uint64_t session_id,
+               struct lttng_trace_chunk *chunk)
+{
+       bool unused;
+
+       return lttng_trace_chunk_registry_publish_chunk(
+                       registry, session_id, chunk, &unused);
+}
+
+struct lttng_trace_chunk *
+lttng_trace_chunk_registry_publish_chunk(
+               struct lttng_trace_chunk_registry *registry,
+               uint64_t session_id, struct lttng_trace_chunk *chunk,
+               bool *previously_published)
 {
        struct lttng_trace_chunk_registry_element *element;
        unsigned long element_hash;
@@ -2019,6 +2050,7 @@ lttng_trace_chunk_registry_publish_chunk(
                        element->registry = registry;
                        /* Acquire a reference for the caller. */
                        if (lttng_trace_chunk_get(&element->chunk)) {
+                               *previously_published = false;
                                break;
                        } else {
                                /*
@@ -2045,6 +2077,7 @@ lttng_trace_chunk_registry_publish_chunk(
                if (lttng_trace_chunk_get(published_chunk)) {
                        lttng_trace_chunk_put(&element->chunk);
                        element = published_element;
+                       *previously_published = true;
                        break;
                }
                /*