In kernel-2.4.20, the attribute d_hash in struct dentry is type of list_head. So you can use function list_empty defined in list.h to check whether the hash list is empty.

But in kernel-2.6.27, the type of the attribute d_hash has been changed to hlist_node, then if you want to check whether the hash list is empty, the function list_empty will not work any more.

What should I do to solve the problem??

Another question is that there are two function concerned with hlist defined in list.h: hlist_unhash and hlist_empty. What are the differences between the two functions?

Please post your thread once and in only one forum. Posting a single thread in the most relevant forum will make it easier for members to help you and will keep the discussion in one place. This thread should be closed because it is a duplicate of http://www.linuxquestions.org/questi...h-list-729605/.