dentry1 2904 fs/dcache.c void d_exchange(struct dentry *dentry1, struct dentry *dentry2) dentry1 2908 fs/dcache.c WARN_ON(!dentry1->d_inode); dentry1 2910 fs/dcache.c WARN_ON(IS_ROOT(dentry1)); dentry1 2913 fs/dcache.c __d_move(dentry1, dentry2, true);