Add btrfs tracepoint for em's EEXIST case

See upstream commits:

  commit 393da91819e35af538ef97c7c6a04899e2fbfe0e
  Author: Liu Bo <bo.li.liu@oracle.com>
  Date:   Fri Jan 5 12:51:16 2018 -0700

    Btrfs: add tracepoint for em's EEXIST case

    This is adding a tracepoint 'btrfs_handle_em_exist' to help debug the
    subtle bugs around merge_extent_mapping.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/instrumentation/events/lttng-module/btrfs.h b/instrumentation/events/lttng-module/btrfs.h
index a3aa606567fdbbcdc3e6b2c5fc0145ba76bee55a..9f941ba2eddddbe13983d0b92f2e96ce77bbe8f9 100644 (file)
--- a/instrumentation/events/lttng-module/btrfs.h
+++ b/instrumentation/events/lttng-module/btrfs.h
@@ -289,6 +289,24 @@ LTTNG_TRACEPOINT_EVENT(btrfs_get_extent,
 
 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,17,0))
+LTTNG_TRACEPOINT_EVENT(btrfs_handle_em_exist,
+
+       TP_PROTO(const struct extent_map *existing, const struct extent_map *map, u64 start, u64 len),
+
+       TP_ARGS(existing, map, start, len),
+
+       TP_FIELDS(
+               ctf_integer(u64, e_start, existing->start)
+               ctf_integer(u64, e_len, existing->len)
+               ctf_integer(u64, map_start, map->start)
+               ctf_integer(u64, map_len, map->len)
+               ctf_integer(u64, start, start)
+               ctf_integer(u64, len, len)
+       )
+)
+#endif
+
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,14,0))
 LTTNG_TRACEPOINT_EVENT_CLASS(btrfs__ordered_extent,