fs/autofs/dir.c

   1 /* -*- linux-c -*- --------------------------------------------------------- *
   2  *
   3  * linux/fs/autofs/dir.c
   4  *
   5  *  Copyright 1997 Transmeta Corporation -- All Rights Reserved
   6  *
   7  * This file is part of the Linux kernel and is made available under
   8  * the terms of the GNU General Public License, version 2, or at your
   9  * option, any later version, incorporated herein by reference.
  10  *
  11  * ------------------------------------------------------------------------- */
  12
  13 #include "autofs_i.h"
  14
  15 static int autofs_dir_readdir(struct file *filp,
  16                                void *dirent, filldir_t filldir)
  17 {
  18         struct inode *inode=filp->f_dentry->d_inode;
  19         if (!inode || !S_ISDIR(inode->i_mode))
  20                 return -ENOTDIR;
  21
  22         switch((unsigned long) filp->f_pos)
  23         {
  24         case 0:
  25                 if (filldir(dirent, ".", 1, 0, inode->i_ino) < 0)
  26                         return 0;
  27                 filp->f_pos++;
  28                 /* fall through */
  29         case 1:
  30                 if (filldir(dirent, "..", 2, 1, AUTOFS_ROOT_INO) < 0)
  31                         return 0;
  32                 filp->f_pos++;
  33                 /* fall through */
  34         }
  35         return 1;
  36 }
  37
  38 /*
  39  * No entries except for "." and "..", both of which are handled by the VFS layer
  40  */
  41 static int autofs_dir_lookup(struct inode *dir, struct dentry * dentry)
  42 {
  43         d_add(dentry, NULL);
  44         return 0;
  45 }
  46
  47 static struct file_operations autofs_dir_operations = {
  48         NULL,                   /* llseek */
  49         NULL,                   /* read */
  50         NULL,                   /* write */
  51         autofs_dir_readdir,     /* readdir */
  52         NULL,                   /* poll */
  53         NULL,                   /* ioctl */
  54         NULL,                   /* mmap */
  55         NULL,                   /* open */
  56         NULL,                   /* flush */
  57         NULL,                   /* release */
  58         NULL,                   /* fsync */
  59         NULL,                   /* fasync */
  60         NULL,                   /* check_media_change */
  61         NULL,                   /* revalidate */
  62         NULL                    /* lock */
  63 };
  64
  65 struct inode_operations autofs_dir_inode_operations = {
  66         &autofs_dir_operations, /* file operations */
  67         NULL,                   /* create */
  68         autofs_dir_lookup,      /* lookup */
  69         NULL,                   /* link */
  70         NULL,                   /* unlink */
  71         NULL,                   /* symlink */
  72         NULL,                   /* mkdir */
  73         NULL,                   /* rmdir */
  74         NULL,                   /* mknod */
  75         NULL,                   /* rename */
  76         NULL,                   /* readlink */
  77         NULL,                   /* follow_link */
  78         NULL,                   /* readpage */
  79         NULL,                   /* writepage */
  80         NULL,                   /* bmap */
  81         NULL,                   /* truncate */
  82         NULL,                   /* permission */
  83         NULL,                   /* smap */
  84         NULL,                   /* updatepage */
  85         NULL                    /* revalidate */
  86 };
  87