ls_dir in /mount_point/dir1/ failed

[mohamadrezashafie]

Hi ...
I used lwext4 for my college project on imx7 board. All features worked right but when use ls_dir for directory in another directory failed. in ext4_blockdev.c (ext4_block_get_noread return EIO). Do i use this method correct? Do i need some another code before ls_dir?
ls_dir worked for mount point directory but its failed for child directory...