btrfs: add tracepoints for ordered extents

When debugging a reference counting issue with ordered extents, I've found
we're lacking a lot of tracepoint coverage in the ordered extent code.

Close these gaps by adding tracepoints after every refcount_inc() in the
ordered extent code.

Reviewed-by: Boris Burkov <boris@bur.io>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index 29fa8ea2cc0f..73df80d462dc 100644
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -598,6 +598,70 @@ DEFINE_EVENT(btrfs__ordered_extent, btrfs_ordered_extent_put,
 	TP_ARGS(inode, ordered)
 );
 
+DEFINE_EVENT(btrfs__ordered_extent, btrfs_ordered_extent_lookup,
+
+	     TP_PROTO(const struct btrfs_inode *inode,
+		      const struct btrfs_ordered_extent *ordered),
+
+	     TP_ARGS(inode, ordered)
+);
+
+DEFINE_EVENT(btrfs__ordered_extent, btrfs_ordered_extent_lookup_range,
+
+	     TP_PROTO(const struct btrfs_inode *inode,
+		      const struct btrfs_ordered_extent *ordered),
+
+	     TP_ARGS(inode, ordered)
+);
+
+DEFINE_EVENT(btrfs__ordered_extent, btrfs_ordered_extent_lookup_first_range,
+
+	     TP_PROTO(const struct btrfs_inode *inode,
+		      const struct btrfs_ordered_extent *ordered),
+
+	     TP_ARGS(inode, ordered)
+);
+
+DEFINE_EVENT(btrfs__ordered_extent, btrfs_ordered_extent_lookup_for_logging,
+
+	     TP_PROTO(const struct btrfs_inode *inode,
+		      const struct btrfs_ordered_extent *ordered),
+
+	     TP_ARGS(inode, ordered)
+);
+
+DEFINE_EVENT(btrfs__ordered_extent, btrfs_ordered_extent_lookup_first,
+
+	     TP_PROTO(const struct btrfs_inode *inode,
+		      const struct btrfs_ordered_extent *ordered),
+
+	     TP_ARGS(inode, ordered)
+);
+
+DEFINE_EVENT(btrfs__ordered_extent, btrfs_ordered_extent_split,
+
+	     TP_PROTO(const struct btrfs_inode *inode,
+		      const struct btrfs_ordered_extent *ordered),
+
+	     TP_ARGS(inode, ordered)
+);
+
+DEFINE_EVENT(btrfs__ordered_extent, btrfs_ordered_extent_dec_test_pending,
+
+	     TP_PROTO(const struct btrfs_inode *inode,
+		      const struct btrfs_ordered_extent *ordered),
+
+	     TP_ARGS(inode, ordered)
+);
+
+DEFINE_EVENT(btrfs__ordered_extent, btrfs_ordered_extent_mark_finished,
+
+	     TP_PROTO(const struct btrfs_inode *inode,
+		      const struct btrfs_ordered_extent *ordered),
+
+	     TP_ARGS(inode, ordered)
+);
+
 DECLARE_EVENT_CLASS(btrfs__writepage,
 
 	TP_PROTO(const struct page *page, const struct inode *inode,