[lttng-dev] [PATCH lttng-modules 1/3] Add btrfs tracepoint for em's EEXIST case

[Michael Jeanson]

See upstream commits:

  commit 393da91819e35af538ef97c7c6a04899e2fbfe0e
  Author: Liu Bo <bo.li.liu at 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 at efficios.com>
---
 instrumentation/events/lttng-module/btrfs.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/instrumentation/events/lttng-module/btrfs.h b/instrumentation/events/lttng-module/btrfs.h
index 4eb0db2..c413e92 100644
--- a/instrumentation/events/lttng-module/btrfs.h
+++ b/instrumentation/events/lttng-module/btrfs.h
@@ -273,6 +273,24 @@ 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,
 
-- 
2.17.1