f2fs: add tracepoint for f2fs_filemap_fault()

This patch adds tracepoint for f2fs_filemap_fault().

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/file.c

@@ -39,6 +39,8 @@ static vm_fault_t f2fs_filemap_fault(struct vm_fault *vmf)
 	ret = filemap_fault(vmf);
 	up_read(&F2FS_I(inode)->i_mmap_sem);
 
+	trace_f2fs_filemap_fault(inode, vmf->pgoff, (unsigned long)ret);
+
 	return ret;
 }