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.m_vfs_fs_readsuper.device;
  18   label_gid = fs_m_in.m_vfs_fs_readsuper.grant;
  19   label_len = fs_m_in.m_vfs_fs_readsuper.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, BDEV_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   lmfs_set_blocksize(v_pri.logical_block_size_l, major(fs_dev));
  47
  48   /* Return some root inode properties */
  49   fs_m_out.m_fs_vfs_readsuper.inode = ID_DIR_RECORD(v_pri.dir_rec_root);
  50   fs_m_out.m_fs_vfs_readsuper.mode = v_pri.dir_rec_root->d_mode;
  51   fs_m_out.m_fs_vfs_readsuper.file_size = v_pri.dir_rec_root->d_file_size;
  52   fs_m_out.m_fs_vfs_readsuper.uid = SYS_UID; /* Always root */
  53   fs_m_out.m_fs_vfs_readsuper.gid = SYS_GID; /* operator */
  54   fs_m_out.m_fs_vfs_readsuper.flags = RES_NOFLAGS;
  55
  56   return(r);
  57 }
  58
  59
  60 /*===========================================================================*
  61  *                              fs_mountpoint                                *
  62  *===========================================================================*/
  63 int fs_mountpoint()
  64 {
  65 /* This function looks up the mount point, it checks the condition whether
  66  * the partition can be mounted on the inode or not.
  67  */
  68
  69   register struct dir_record *rip;
  70   int r = OK;
  71
  72   /* Temporarily open the file. */
  73   if ((rip = get_dir_record(fs_m_in.m_vfs_fs_mountpoint.inode)) == NULL)
  74         return(EINVAL);
  75
  76   if (rip->d_mountpoint)
  77         r = EBUSY;
  78
  79   /* If the inode is not a dir returns error */
  80   if ((rip->d_mode & I_TYPE) != I_DIRECTORY)
  81         r = ENOTDIR;
  82
  83   release_dir_record(rip);
  84
  85   if (r == OK)
  86         rip->d_mountpoint = TRUE;
  87
  88   return(r);
  89 }
  90
  91
  92 /*===========================================================================*
  93  *                              fs_unmount                                   *
  94  *===========================================================================*/
  95 int fs_unmount(void) {
  96   release_v_pri(&v_pri);        /* Release the super block */
  97   bdev_close(fs_dev);
  98   unmountdone = TRUE;
  99   return(OK);
 100 }
 101