Fix: handle concurrent flush vs get_next_subbuf on metadata cache

[lttng-modules.git] / lttng-events.h

diff --git a/lttng-events.h b/lttng-events.h
index f0628c4cd7a9582e7f2a271c8ddd0b092edd7a54..3e8f80935e6449a196d88adc3a0ed2fcb77599d2 100644 (file)
--- a/lttng-events.h
+++ b/lttng-events.h
@@ -170,7 +170,8 @@ struct lttng_ctx {
 };
 
 struct lttng_event_desc {
-       const char *name;
+       const char *name;               /* lttng-modules name */
+       const char *kname;              /* Linux kernel name (tracepoints) */
        void *probe_callback;
        const struct lttng_event_ctx *ctx;      /* context */
        const struct lttng_event_field *fields; /* event payload */
@@ -235,6 +236,10 @@ struct lttng_channel_ops {
                                      const void *src, size_t len);
        void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
                             int c, size_t len);
+       void (*event_strcpy)(struct lib_ring_buffer_ctx *ctx, const char *src,
+                            size_t len);
+       void (*event_strcpy_from_user)(struct lib_ring_buffer_ctx *ctx,
+                                      const char __user *src, size_t len);
        /*
         * packet_avail_size returns the available size in the current
         * packet. Note that the size returned is only a hint, since it
@@ -306,6 +311,7 @@ struct lttng_metadata_stream {
        wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
        struct list_head list;          /* Stream list */
        struct lttng_transport *transport;
+       struct mutex lock;
 };
 
 struct lttng_session {