f2fs: trace elapsed time for node_change lock

Use f2fs_{down,up}_read_trace for node_change to trace lock elapsed time.

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Author: chaseyu

fs/f2fs/data.c

@@ -1472,7 +1472,7 @@ static void f2fs_map_lock(struct f2fs_sb_info *sbi,
 {
 	f2fs_down_read(&sbi->cp_enable_rwsem);
 	if (flag == F2FS_GET_BLOCK_PRE_AIO)
-		f2fs_down_read(&sbi->node_change);
+		f2fs_down_read_trace(&sbi->node_change, lc);
 	else
 		f2fs_lock_op(sbi, lc);
 }
@@ -1482,7 +1482,7 @@ static void f2fs_map_unlock(struct f2fs_sb_info *sbi,
 				int flag)
 {
 	if (flag == F2FS_GET_BLOCK_PRE_AIO)
-		f2fs_up_read(&sbi->node_change);
+		f2fs_up_read_trace(&sbi->node_change, lc);
 	else
 		f2fs_unlock_op(sbi, lc);
 	f2fs_up_read(&sbi->cp_enable_rwsem);

fs/f2fs/f2fs.h

@@ -176,6 +176,7 @@ enum device_allocation_policy {
 enum f2fs_lock_name {
 	LOCK_NAME_NONE,
 	LOCK_NAME_CP_RWSEM,
+	LOCK_NAME_NODE_CHANGE,
 };
 
 /*

fs/f2fs/super.c

@@ -4897,7 +4897,7 @@ static int f2fs_fill_super(struct super_block *sb, struct fs_context *fc)
 	mutex_init(&sbi->writepages);
 	init_f2fs_rwsem(&sbi->cp_global_sem);
 	init_f2fs_rwsem(&sbi->node_write);
-	init_f2fs_rwsem(&sbi->node_change);
+	init_f2fs_rwsem_trace(&sbi->node_change, sbi, LOCK_NAME_NODE_CHANGE);
 	spin_lock_init(&sbi->stat_lock);
 	init_f2fs_rwsem_trace(&sbi->cp_rwsem, sbi, LOCK_NAME_CP_RWSEM);
 	init_f2fs_rwsem(&sbi->cp_enable_rwsem);

include/trace/events/f2fs.h

@@ -186,7 +186,8 @@ TRACE_DEFINE_ENUM(CP_PHASE_FINISH_CHECKPOINT);
 
 #define show_lock_name(lock)						\
 	__print_symbolic(lock,						\
-		{ LOCK_NAME_CP_RWSEM,		"cp_rwsem" })
+		{ LOCK_NAME_CP_RWSEM,		"cp_rwsem" },		\
+		{ LOCK_NAME_NODE_CHANGE,	"node_change" })
 
 struct f2fs_sb_info;
 struct f2fs_io_info;