projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 88859601 KM |
1 | /* |
| 2 | * Copyright (c) 1990 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 6dc0e27a | 5 | * %sccs.include.redist.c% |
| 88859601 | 6 | * |
| 6dc0e27a | 7 | * @(#)specdev.h 7.2 (Berkeley) %G% |
| 88859601 KM |
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]; |