lib/libvtreefs/mount.c

   1 /* VTreeFS - mount.c - by Alen Stojanov and David van Moolenbroek */
   2
   3 #include "inc.h"
   4
   5 /*===========================================================================*
   6  *                              fs_readsuper                                 *
   7  *===========================================================================*/
   8 int fs_readsuper(void)
   9 {
  10         /* This function gets the root inode and sends back its details.
  11          */
  12         struct inode *root;
  13
  14         /* Get the device number, for stat requests. */
  15         fs_dev = fs_m_in.REQ_DEV;
  16
  17         /* The VTreeFS must not be mounted as a root file system. */
  18         if (fs_m_in.REQ_FLAGS & REQ_ISROOT)
  19                 return EINVAL;
  20
  21         /* Get the root inode and increase its reference count. */
  22         root = get_root_inode();
  23         ref_inode(root);
  24
  25         /* The system is now mounted. Call the initialization hook. */
  26         if (vtreefs_hooks->init_hook != NULL)
  27                 vtreefs_hooks->init_hook();
  28
  29         /* Return the root inode's properties. */
  30         fs_m_out.RES_INODE_NR = get_inode_number(root);
  31         fs_m_out.RES_MODE = root->i_stat.mode;
  32         fs_m_out.RES_FILE_SIZE_HI = 0;
  33         fs_m_out.RES_FILE_SIZE_LO = root->i_stat.size;
  34         fs_m_out.RES_UID = root->i_stat.uid;
  35         fs_m_out.RES_GID = root->i_stat.gid;
  36         fs_m_out.RES_DEV = NO_DEV;
  37
  38         fs_m_out.RES_CONREQS = 1;/* We can handle only 1 request at a time */
  39
  40         fs_mounted = TRUE;
  41
  42         return OK;
  43 }
  44
  45 /*===========================================================================*
  46  *                              fs_unmount                                   *
  47  *===========================================================================*/
  48 int fs_unmount(void)
  49 {
  50         /* Unmount the file system.
  51          */
  52         struct inode *root;
  53
  54         /* Decrease the count of the root inode. */
  55         root = get_root_inode();
  56
  57         put_inode(root);
  58
  59         /* The system is unmounted. Call the cleanup hook. */
  60         if (vtreefs_hooks->cleanup_hook != NULL)
  61                 vtreefs_hooks->cleanup_hook();
  62
  63         /* We can now be shut down safely. */
  64         fs_mounted = FALSE;
  65
  66         return OK;
  67 }