Man page 9 : d_add_ci

d_add_ci - lookup or allocate new dentry with case-exact name

struct dentry * d_add_ci(struct dentry *  dentry , struct inode *  inode , struct qstr *  name );

dentry
    the negative dentry that was passed to the parentAqs lookup func

inode
    the inode case-insensitive lookup has found

name
    the case-exact name to be associated with the returned dentry

This is to avoid filling the dcache with case-insensitive names to the same inode, only the actual correct case is stored in the dcache for case-insensitive filesystems.

For a case-insensitive lookup match and if the the case-exact dentry already exists in in the dcache, use it and return it.

If no entry exists with the exact case name, allocate new dentry with the exact case, and return the spliced entry.