[PATCH v4 9/9] btrfs: add tracepoints for ordered stripes

[Johannes Thumshirn <johannes.thumshirn@wdc.com>]

Add tracepoints to check the lifetime of btrfs_ordered_stripe entries.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 fs/btrfs/raid-stripe-tree.c  |  3 +++
 fs/btrfs/super.c             |  1 +
 include/trace/events/btrfs.h | 50 ++++++++++++++++++++++++++++++++++++
 3 files changed, 54 insertions(+)

diff --git a/fs/btrfs/raid-stripe-tree.c b/fs/btrfs/raid-stripe-tree.c
index ed13b30001e0..b5ef3daec295 100644
--- a/fs/btrfs/raid-stripe-tree.c
+++ b/fs/btrfs/raid-stripe-tree.c
@@ -106,6 +106,7 @@ int btrfs_add_ordered_stripe(struct btrfs_io_context *bioc)
 		return -EINVAL;
 	}
 
+	trace_btrfs_ordered_stripe_add(fs_info, stripe);
 	return 0;
 }
 
@@ -121,6 +122,7 @@ struct btrfs_ordered_stripe *btrfs_lookup_ordered_stripe(struct btrfs_fs_info *f
 	if (node) {
 		stripe = rb_entry(node, struct btrfs_ordered_stripe, rb_node);
 		refcount_inc(&stripe->ref);
+		trace_btrfs_ordered_stripe_lookup(fs_info, stripe);
 	}
 	read_unlock(&fs_info->stripe_update_lock);
 
@@ -131,6 +133,7 @@ void btrfs_put_ordered_stripe(struct btrfs_fs_info *fs_info,
 				 struct btrfs_ordered_stripe *stripe)
 {
 	write_lock(&fs_info->stripe_update_lock);
+	trace_btrfs_ordered_stripe_put(fs_info, stripe);
 	if (refcount_dec_and_test(&stripe->ref)) {
 		struct rb_node *node = &stripe->rb_node;
 
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 93f52ee85f6f..532852105668 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -58,6 +58,7 @@
 #include "scrub.h"
 #include "verity.h"
 #include "super.h"
+#include "raid-stripe-tree.h"
 #define CREATE_TRACE_POINTS
 #include <trace/events/btrfs.h>
 
diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index 0bce0b4ff2fa..93b0fbc69413 100644
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -32,6 +32,7 @@ struct prelim_ref;
 struct btrfs_space_info;
 struct btrfs_raid_bio;
 struct raid56_bio_trace_info;
+struct btrfs_ordered_stripe;
 
 #define show_ref_type(type)						\
 	__print_symbolic(type,						\
@@ -2411,6 +2412,55 @@ DEFINE_EVENT(btrfs_raid56_bio, raid56_scrub_read_recover,
 	TP_ARGS(rbio, bio, trace_info)
 );
 
+DECLARE_EVENT_CLASS(btrfs__ordered_stripe,
+
+	TP_PROTO(const struct btrfs_fs_info *fs_info,
+		 const struct btrfs_ordered_stripe *stripe),
+
+	TP_ARGS(fs_info, stripe),
+
+	TP_STRUCT__entry_btrfs(
+		__field(	u64,	logical		)
+		__field(	u64,	num_bytes	)
+		__field(	int,	num_stripes	)
+		__field(	int,	ref		)
+	),
+
+	TP_fast_assign_btrfs(fs_info,
+		__entry->logical	= stripe->logical;
+		__entry->num_bytes	= stripe->num_bytes;
+		__entry->num_stripes	= stripe->num_stripes;
+		__entry->ref		= refcount_read(&stripe->ref);
+	),
+
+	TP_printk_btrfs("logical=%llu, num_bytes=%llu, num_stripes=%d, ref=%d",
+			__entry->logical, __entry->num_bytes,
+			__entry->num_stripes, __entry->ref)
+);
+
+DEFINE_EVENT(btrfs__ordered_stripe, btrfs_ordered_stripe_add,
+
+	     TP_PROTO(const struct btrfs_fs_info *fs_info,
+		      const struct btrfs_ordered_stripe *stripe),
+
+	     TP_ARGS(fs_info, stripe)
+);
+
+DEFINE_EVENT(btrfs__ordered_stripe, btrfs_ordered_stripe_lookup,
+
+	     TP_PROTO(const struct btrfs_fs_info *fs_info,
+		      const struct btrfs_ordered_stripe *stripe),
+
+	     TP_ARGS(fs_info, stripe)
+);
+
+DEFINE_EVENT(btrfs__ordered_stripe, btrfs_ordered_stripe_put,
+
+	     TP_PROTO(const struct btrfs_fs_info *fs_info,
+		      const struct btrfs_ordered_stripe *stripe),
+
+	     TP_ARGS(fs_info, stripe)
+);
 #endif /* _TRACE_BTRFS_H */
 
 /* This part must be outside protection */
-- 
2.38.1