minix/servers/vfs/const.h

   1 #ifndef __VFS_CONST_H__
   2 #define __VFS_CONST_H__
   3
   4 /* Tables sizes */
   5 #define NR_FILPS        1024    /* # slots in filp table */
   6 #define NR_LOCKS           8    /* # slots in the file locking table */
   7 #define NR_MNTS           16    /* # slots in mount table */
   8 #define NR_VNODES       1024    /* # slots in vnode table */
   9 #define NR_WTHREADS        9    /* # slots in worker thread table */
  10 #define NR_SOCKDEVS        8    /* # slots in smap table */
  11
  12 #define NR_NONEDEVS     NR_MNTS /* # slots in nonedev bitmap */
  13
  14 /* Miscellaneous constants */
  15 #define SU_UID   ((uid_t) 0)    /* super_user's uid_t */
  16 #define SYS_UID  ((uid_t) 0)    /* uid_t for system processes and INIT */
  17 #define SYS_GID  ((gid_t) 0)    /* gid_t for system processes and INIT */
  18
  19 #define FP_BLOCKED_ON_NONE      0 /* not blocked */
  20 #define FP_BLOCKED_ON_PIPE      1 /* susp'd on pipe */
  21 #define FP_BLOCKED_ON_FLOCK     2 /* susp'd on file lock */
  22 #define FP_BLOCKED_ON_POPEN     3 /* susp'd on pipe open */
  23 #define FP_BLOCKED_ON_SELECT    4 /* susp'd on select */
  24 #define FP_BLOCKED_ON_CDEV      5 /* blocked on character device I/O */
  25 #define FP_BLOCKED_ON_SDEV      6 /* blocked on socket I/O */
  26
  27 /* test if the process is blocked on something */
  28 #define fp_is_blocked(fp)       ((fp)->fp_blocked_on != FP_BLOCKED_ON_NONE)
  29
  30 #define INVALID_THREAD  ((thread_t) -1)         /* known-invalid thread ID */
  31
  32 #define SYMLOOP         16
  33
  34 #define LABEL_MAX       16      /* maximum label size (including '\0'). Should
  35                                  * not be smaller than 16 or bigger than
  36                                  * M_PATH_STRING_MAX.
  37                                  */
  38 #define FSTYPE_MAX      VFS_NAMELEN     /* maximum file system type size */
  39
  40 /* possible select() operation types; read, write, errors */
  41 #define SEL_RD          CDEV_OP_RD
  42 #define SEL_WR          CDEV_OP_WR
  43 #define SEL_ERR         CDEV_OP_ERR
  44 #define SEL_NOTIFY      CDEV_NOTIFY /* not a real select operation */
  45 /* If these constants diverge, VFS must be extended to perform mapping. */
  46 #if (CDEV_OP_RD != SDEV_OP_RD || CDEV_OP_WR != SDEV_OP_WR || \
  47     CDEV_OP_ERR != SDEV_OP_ERR || CDEV_NOTIFY != SDEV_NOTIFY)
  48 #error "CDEV and SDEV select constants are different"
  49 #endif
  50
  51 /* special driver endpoint for CTTY_MAJOR; must be able to pass isokendpt() */
  52 #define CTTY_ENDPT      VFS_PROC_NR
  53
  54 #endif