Man page 9 : find_inode_number

find_inode_number - check for dentry with name

ino_t find_inode_number(struct dentry *  dir , struct qstr *  name );

dir
    directory to check

name
    Name to find.

Check whether a dentry already exists for the given name, and return the inode number if it has an inode. Otherwise 0 is returned.

This routine is used to post-process directory listings for filesystems using synthetic inode numbers, and is necessary to keep getcwd working.