+static int devpts_readdir(struct file * filp, void * dirent, filldir_t filldir)
+{
+ struct dentry *dentry = filp->f_dentry;
+ struct dentry *cursor = filp->private_data;
+ struct list_head *p, *q = &cursor->d_child;
+ ino_t ino;
+ int i = filp->f_pos;
+
+ switch (i) {
+ case 0:
+ ino = dentry->d_inode->i_ino;
+ if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
+ break;
+ filp->f_pos++;
+ i++;
+ /* fallthrough */
+ case 1:
+ ino = parent_ino(dentry);
+ if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
+ break;
+ filp->f_pos++;
+ i++;
+ /* fallthrough */
+ default:
+ spin_lock(&dcache_lock);
+ if (filp->f_pos == 2) {
+ list_del(q);
+ list_add(q, &dentry->d_subdirs);
+ }
+ for (p=q->next; p != &dentry->d_subdirs; p=p->next) {
+ struct dentry *next;
+ next = list_entry(p, struct dentry, d_child);
+ if (d_unhashed(next) || !next->d_inode)
+ continue;
+ if (!vx_check(next->d_inode->i_xid, VX_IDENT))
+ continue;
+
+ spin_unlock(&dcache_lock);
+ if (filldir(dirent, next->d_name.name,
+ next->d_name.len, filp->f_pos,
+ next->d_inode->i_ino, DT_CHR) < 0)
+ return 0;
+ spin_lock(&dcache_lock);
+ /* next is still alive */
+ list_del(q);
+ list_add(q, p);
+ p = q;
+ filp->f_pos++;
+ }
+ spin_unlock(&dcache_lock);
+ }
+ return 0;
+}
+
+static struct file_operations devpts_dir_operations = {
+ .open = dcache_dir_open,
+ .release = dcache_dir_close,
+ .llseek = dcache_dir_lseek,
+ .read = generic_read_dir,
+ .readdir = devpts_readdir,
+};
+