btrfs: tracepoints: also show actual number of the outstanding extents

The btrfs_inode_mod_outstanding_extents trace event only shows the modified
number to the number of outstanding extents. It would be helpful if we can
see the resulting extent number as well.
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/btrfs_inode.h

@@ -332,7 +332,7 @@ static inline void btrfs_mod_outstanding_extents(struct btrfs_inode *inode,
 	if (btrfs_is_free_space_inode(inode))
 		return;
 	trace_btrfs_inode_mod_outstanding_extents(inode->root, btrfs_ino(inode),
-						  mod);
+						  mod, inode->outstanding_extents);
 }
 
 /*

include/trace/events/btrfs.h

@@ -2011,25 +2011,27 @@ DEFINE_EVENT(btrfs__prelim_ref, btrfs_prelim_ref_insert,
 );
 
 TRACE_EVENT(btrfs_inode_mod_outstanding_extents,
-	TP_PROTO(const struct btrfs_root *root, u64 ino, int mod),
+	TP_PROTO(const struct btrfs_root *root, u64 ino, int mod, unsigned outstanding),
 
-	TP_ARGS(root, ino, mod),
+	TP_ARGS(root, ino, mod, outstanding),
 
 	TP_STRUCT__entry_btrfs(
 		__field(	u64, root_objectid	)
 		__field(	u64, ino		)
 		__field(	int, mod		)
+		__field(	unsigned, outstanding	)
 	),
 
 	TP_fast_assign_btrfs(root->fs_info,
 		__entry->root_objectid	= root->root_key.objectid;
 		__entry->ino		= ino;
 		__entry->mod		= mod;
+		__entry->outstanding    = outstanding;
 	),
 
-	TP_printk_btrfs("root=%llu(%s) ino=%llu mod=%d",
+	TP_printk_btrfs("root=%llu(%s) ino=%llu mod=%d outstanding=%u",
 			show_root_type(__entry->root_objectid),
-			__entry->ino, __entry->mod)
+			__entry->ino, __entry->mod, __entry->outstanding)
 );
 
 DECLARE_EVENT_CLASS(btrfs__block_group,