| 1 | /* |
| 2 | * Copyright (c) 1990 The Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * %sccs.include.redist.c% |
| 6 | * |
| 7 | * @(#)specdev.h 7.2 (Berkeley) %G% |
| 8 | */ |
| 9 | |
| 10 | /* |
| 11 | * This structure defines the information maintained about |
| 12 | * special devices. It is allocated in checkalias and freed |
| 13 | * in vgone. |
| 14 | */ |
| 15 | struct specinfo { |
| 16 | struct vnode **si_hashchain; |
| 17 | struct vnode *si_specnext; |
| 18 | long si_flags; |
| 19 | dev_t si_rdev; |
| 20 | }; |
| 21 | /* |
| 22 | * Exported shorthand |
| 23 | */ |
| 24 | #define v_rdev v_specinfo->si_rdev |
| 25 | #define v_hashchain v_specinfo->si_hashchain |
| 26 | #define v_specnext v_specinfo->si_specnext |
| 27 | #define v_specflags v_specinfo->si_flags |
| 28 | |
| 29 | /* |
| 30 | * Flags for specinfo |
| 31 | */ |
| 32 | #define SI_MOUNTEDON 0x0001 /* block special device is mounted on */ |
| 33 | |
| 34 | /* |
| 35 | * Special device management |
| 36 | */ |
| 37 | #define SPECHSZ 64 |
| 38 | #if ((SPECHSZ&(SPECHSZ-1)) == 0) |
| 39 | #define SPECHASH(rdev) (((rdev>>5)+(rdev))&(SPECHSZ-1)) |
| 40 | #else |
| 41 | #define SPECHASH(rdev) (((unsigned)((rdev>>5)+(rdev)))%SPECHSZ) |
| 42 | #endif |
| 43 | |
| 44 | struct vnode *speclisth[SPECHSZ]; |