minix/fs/isofs/mount.c

   1 #include "inc.h"
   2 #include <minix/vfsif.h>
   3
   4 int fs_mount(dev_t dev, unsigned int __unused flags,
   5         struct fsdriver_node *root_node, unsigned int *res_flags)
   6 {
   7         int r;
   8
   9         fs_dev = dev;
  10
  11         /* Open the device the file system lives on in read only mode */
  12         if (bdev_open(fs_dev, BDEV_R_BIT) != OK)
  13                 return EINVAL;
  14
  15         /* Read the superblock */
  16         r = read_vds(&v_pri, fs_dev);
  17         if (r != OK) {
  18                 bdev_close(fs_dev);
  19                 return r;
  20         }
  21
  22         /* Return some root inode properties */
  23         root_node->fn_ino_nr = v_pri.inode_root->i_stat.st_ino;
  24         root_node->fn_mode = v_pri.inode_root->i_stat.st_mode;
  25         root_node->fn_size = v_pri.inode_root->i_stat.st_size;
  26         root_node->fn_uid = SYS_UID; /* Always root */
  27         root_node->fn_gid = SYS_GID; /* wheel */
  28         root_node->fn_dev = NO_DEV;
  29
  30         *res_flags = RES_NOFLAGS;
  31
  32         return r;
  33 }
  34
  35 int fs_mountpt(ino_t ino_nr)
  36 {
  37         /*
  38          * This function looks up the mount point, it checks the condition
  39          * whether the partition can be mounted on the inode or not.
  40          */
  41         struct inode *rip;
  42
  43         if ((rip = get_inode(ino_nr)) == NULL)
  44                 return EINVAL;
  45
  46         if (rip->i_mountpoint)
  47                 return EBUSY;
  48
  49         /* The inode must be a directory. */
  50         if ((rip->i_stat.st_mode & I_TYPE) != I_DIRECTORY)
  51                 return ENOTDIR;
  52
  53         rip->i_mountpoint = TRUE;
  54
  55         return OK;
  56 }
  57
  58 void fs_unmount(void)
  59 {
  60         release_vol_pri_desc(&v_pri);   /* Release the super block */
  61
  62         bdev_close(fs_dev);
  63
  64         if (check_inodes() == FALSE)
  65                 puts("ISOFS: unmounting with in-use inodes!\n");
  66 }