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) 06/28/90 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]; 45