How to check if a file is a present in a directory(directly/indirectly)

[noyb noybee]

I am building a LKM in which I need to check whether a file is inside
a particular directory(directly or inside sub-directories). Is there a
function for this? Do I need to use the lookup function in
inode_operations for this or is there a better method?

Regards,
winged_elite