staging: erofs: support tracepoint

Add basic tracepoints for ->readpage{,s}, ->lookup,
->destroy_inode, fill_inode and map_blocks.

Reviewed-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
index a6d3e12..613c977 100644
--- a/drivers/staging/erofs/inode.c
+++ b/drivers/staging/erofs/inode.c
@@ -12,6 +12,8 @@
  */
 #include "xattr.h"
 
+#include <trace/events/erofs.h>
+
 /* no locking */
 static int read_inode(struct inode *inode, void *data)
 {
@@ -152,6 +154,8 @@ static int fill_inode(struct inode *inode, int isdir)
 	erofs_blk_t blkaddr;
 	unsigned ofs;
 
+	trace_erofs_fill_inode(inode, isdir);
+
 	blkaddr = erofs_blknr(iloc(sbi, vi->nid));
 	ofs = erofs_blkoff(iloc(sbi, vi->nid));