src/afs/afs_dynroot.h

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 /*
  11  * Vnode numbers in dynroot are composed of a type field (upper 8 bits)
  12  * and a type-specific identifier in the lower 24 bits.
  13  */
  14 #define VN_TYPE_CELL            0x01    /* Corresponds to a struct cell */
  15 #define VN_TYPE_ALIAS           0x02    /* Corresponds to a struct cell_alias */
  16 #define VN_TYPE_SYMLINK         0x03    /* User-created symlink in /afs */
  17 #define VN_TYPE_MOUNT           0x04    /* Mount point by volume ID */
  18
  19 #define VNUM_TO_VNTYPE(vnum)    ((vnum) >> 24)
  20 #define VNUM_TO_VNID(vnum)      ((vnum) & 0x00ffffff)
  21 #define VNUM_FROM_TYPEID(type, id) \
  22                                 ((type) << 24 | (id))
  23 #define VNUM_TO_CIDX(vnum)      (VNUM_TO_VNID(vnum) >> 2)
  24 #define VNUM_TO_RW(vnum)        (VNUM_TO_VNID(vnum) >> 1 & 1)
  25 #define VNUM_FROM_CIDX_RW(cidx, rw) \
  26                                 VNUM_FROM_TYPEID(VN_TYPE_CELL, \
  27                                                  ((cidx) << 2 | (rw) << 1))
  28 #define VNUM_FROM_CAIDX_RW(caidx, rw) \
  29                                 VNUM_FROM_TYPEID(VN_TYPE_ALIAS, \
  30                                                  ((caidx) << 2 | (rw) << 1))
  31
  32 #define AFS_DYNROOT_MOUNTNAME   ".:mount"