servers/iso9660fs/mount.c

   1 #include "inc.h"
   2 #include <minix/vfsif.h>
   3 #include <minix/bdev.h>
   4 #include "const.h"
   5 #include "glo.h"
   6
   7
   8 /*===========================================================================*
   9  *                              fs_readsuper                                 *
  10  *===========================================================================*/
  11 int fs_readsuper() {
  12
  13   cp_grant_id_t label_gid;
  14   size_t label_len;
  15   int r = OK;
  16
  17   fs_dev    = fs_m_in.REQ_DEV;
  18   label_gid = fs_m_in.REQ_GRANT;
  19   label_len = fs_m_in.REQ_PATH_LEN;
  20
  21   if (label_len > sizeof(fs_dev_label))
  22         return(EINVAL);
  23
  24   r = sys_safecopyfrom(fs_m_in.m_source, label_gid, 0, (vir_bytes)fs_dev_label,
  25                        label_len);
  26   if (r != OK) {
  27         printf("ISOFS %s:%d safecopyfrom failed: %d\n", __FILE__, __LINE__, r);
  28         return(EINVAL);
  29   }
  30
  31   /* Map the driver label for this major */
  32   bdev_driver(fs_dev, fs_dev_label);
  33
  34   /* Open the device the file system lives on in read only mode */
  35   if (bdev_open(fs_dev, R_BIT) != OK) {
  36         return(EINVAL);
  37   }
  38
  39   /* Read the superblock */
  40   r = read_vds(&v_pri, fs_dev);
  41   if (r != OK) {
  42         bdev_close(fs_dev);
  43         return(r);
  44   }
  45
  46   /* Return some root inode properties */
  47   fs_m_out.RES_INODE_NR = ID_DIR_RECORD(v_pri.dir_rec_root);
  48   fs_m_out.RES_MODE = v_pri.dir_rec_root->d_mode;
  49   fs_m_out.RES_FILE_SIZE_LO = v_pri.dir_rec_root->d_file_size;
  50   fs_m_out.RES_UID = SYS_UID; /* Always root */
  51   fs_m_out.RES_GID = SYS_GID; /* operator */
  52
  53   fs_m_out.RES_CONREQS = 1;     /* We can handle only 1 request at a time */
  54
  55   return(r);
  56 }
  57
  58
  59 /*===========================================================================*
  60  *                              fs_mountpoint                                *
  61  *===========================================================================*/
  62 int fs_mountpoint()
  63 {
  64 /* This function looks up the mount point, it checks the condition whether
  65  * the partition can be mounted on the inode or not.
  66  */
  67
  68   register struct dir_record *rip;
  69   int r = OK;
  70
  71   /* Temporarily open the file. */
  72   if ((rip = get_dir_record(fs_m_in.REQ_INODE_NR)) == NULL)
  73         return(EINVAL);
  74
  75   if (rip->d_mountpoint)
  76         r = EBUSY;
  77
  78   /* If the inode is not a dir returns error */
  79   if ((rip->d_mode & I_TYPE) != I_DIRECTORY)
  80         r = ENOTDIR;
  81
  82   release_dir_record(rip);
  83
  84   if (r == OK)
  85         rip->d_mountpoint = TRUE;
  86
  87   return(r);
  88 }
  89
  90
  91 /*===========================================================================*
  92  *                              fs_unmount                                   *
  93  *===========================================================================*/
  94 int fs_unmount(void) {
  95   release_v_pri(&v_pri);        /* Release the super block */
  96   bdev_close(fs_dev);
  97   unmountdone = TRUE;
  98   return(OK);
  99 }
 100