minix/lib/libpuffs/mount.c

   1 /* Created (MFS based):
   2  *   June 2011 (Evgeniy Ivanov)
   3  */
   4
   5 #include "fs.h"
   6 #include <fcntl.h>
   7 #include <minix/vfsif.h>
   8
   9 /*===========================================================================*
  10  *                              fs_mount                                     *
  11  *===========================================================================*/
  12 int fs_mount(dev_t __unused dev, unsigned int flags,
  13         struct fsdriver_node *root_node, unsigned int *res_flags)
  14 {
  15   struct vattr *root_va;
  16
  17   is_readonly_fs = !!(flags & REQ_RDONLY);
  18
  19   /* Open root pnode */
  20   global_pu->pu_pn_root->pn_count = 1;
  21
  22   /* Root pnode properties */
  23   root_va = &global_pu->pu_pn_root->pn_va;
  24   root_node->fn_ino_nr = root_va->va_fileid;
  25   root_node->fn_mode = root_va->va_mode;
  26   root_node->fn_size = root_va->va_size;
  27   root_node->fn_uid = root_va->va_uid;
  28   root_node->fn_gid = root_va->va_gid;
  29   root_node->fn_dev = NO_DEV;
  30
  31   *res_flags = RES_NOFLAGS;
  32
  33   mounted = TRUE;
  34
  35   return(OK);
  36 }
  37
  38
  39 /*===========================================================================*
  40  *                              fs_mountpt                                   *
  41  *===========================================================================*/
  42 int fs_mountpt(ino_t ino_nr)
  43 {
  44 /* This function looks up the mount point, it checks the condition whether
  45  * the partition can be mounted on the pnode or not.
  46  */
  47   int r = OK;
  48   struct puffs_node *pn;
  49   mode_t bits;
  50
  51   if ((pn = puffs_pn_nodewalk(global_pu, find_inode_cb, &ino_nr)) == NULL)
  52         return(EINVAL);
  53
  54   if (pn->pn_mountpoint) r = EBUSY;
  55
  56   /* It may not be special. */
  57   bits = pn->pn_va.va_mode & I_TYPE;
  58   if(bits == I_BLOCK_SPECIAL || bits == I_CHAR_SPECIAL) r = ENOTDIR;
  59
  60   if (r == OK)
  61         pn->pn_mountpoint = TRUE;
  62
  63   return(r);
  64 }
  65
  66
  67 /*===========================================================================*
  68  *                              fs_unmount                                   *
  69  *===========================================================================*/
  70 void fs_unmount(void)
  71 {
  72   int error;
  73
  74   /* Always force unmounting, as VFS will not tolerate failure. */
  75   error = global_pu->pu_ops.puffs_fs_unmount(global_pu, MNT_FORCE);
  76   if (error) {
  77         lpuffs_debug("user handler failed to unmount filesystem!\
  78                 Force unmount!\n");
  79   }
  80
  81   fs_sync();
  82
  83   /* Finish off the unmount. */
  84   PU_SETSTATE(global_pu, PUFFS_STATE_UNMOUNTED);
  85   mounted = FALSE;
  86   global_pu->pu_pn_root->pn_count--;
  87 }