usr/src/sys/sys/specdev.h

/*
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)specdev.h   7.4 (Berkeley) 4/19/91
 */

/*
 * This structure defines the information maintained about
 * special devices. It is allocated in checkalias and freed
 * in vgone.
 */
struct specinfo {
        struct  vnode **si_hashchain;
        struct  vnode *si_specnext;
        long    si_flags;
        dev_t   si_rdev;
};
/*
 * Exported shorthand
 */
#define v_rdev v_specinfo->si_rdev
#define v_hashchain v_specinfo->si_hashchain
#define v_specnext v_specinfo->si_specnext
#define v_specflags v_specinfo->si_flags

/*
 * Flags for specinfo
 */
#define SI_MOUNTEDON    0x0001  /* block special device is mounted on */

/*
 * Special device management
 */
#define SPECHSZ 64
#if     ((SPECHSZ&(SPECHSZ-1)) == 0)
#define SPECHASH(rdev)  (((rdev>>5)+(rdev))&(SPECHSZ-1))
#else
#define SPECHASH(rdev)  (((unsigned)((rdev>>5)+(rdev)))%SPECHSZ)
#endif

struct vnode *speclisth[SPECHSZ];

/*
 * Prototypes for special file operations on vnodes.
 */
struct  nameidata;
struct  ucred;
struct  flock;
struct  buf;
struct  uio;

int     spec_badop(),
        spec_ebadf();

int     spec_lookup __P((
                struct vnode *vp,
                struct nameidata *ndp,
                struct proc *p));
#define spec_create ((int (*) __P(( \
                struct nameidata *ndp, \
                struct vattr *vap, \
                struct proc *p))) spec_badop)
#define spec_mknod ((int (*) __P(( \
                struct nameidata *ndp, \
                struct vattr *vap, \
                struct ucred *cred, \
                struct proc *p))) spec_badop)
int     spec_open __P((
                struct vnode *vp,
                int mode,
                struct ucred *cred,
                struct proc *p));
int     spec_close __P((
                struct vnode *vp,
                int fflag,
                struct ucred *cred,
                struct proc *p));
#define spec_access ((int (*) __P(( \
                struct vnode *vp, \
                int mode, \
                struct ucred *cred, \
                struct proc *p))) spec_ebadf)
#define spec_getattr ((int (*) __P(( \
                struct vnode *vp, \
                struct vattr *vap, \
                struct ucred *cred, \
                struct proc *p))) spec_ebadf)
#define spec_setattr ((int (*) __P(( \
                struct vnode *vp, \
                struct vattr *vap, \
                struct ucred *cred, \
                struct proc *p))) spec_ebadf)
int     spec_read __P((
                struct vnode *vp,
                struct uio *uio,
                int ioflag,
                struct ucred *cred));
int     spec_write __P((
                struct vnode *vp,
                struct uio *uio,
                int ioflag,
                struct ucred *cred));
int     spec_ioctl __P((
                struct vnode *vp,
                int command,
                caddr_t data,
                int fflag,
                struct ucred *cred,
                struct proc *p));
int     spec_select __P((
                struct vnode *vp,
                int which,
                int fflags,
                struct ucred *cred,
                struct proc *p));
#define spec_mmap ((int (*) __P(( \
                struct vnode *vp, \
                int fflags, \
                struct ucred *cred, \
                struct proc *p))) spec_badop)
#define spec_fsync ((int (*) __P(( \
                struct vnode *vp, \
                int fflags, \
                struct ucred *cred, \
                int waitfor, \
                struct proc *p))) nullop)
#define spec_seek ((int (*) __P(( \
                struct vnode *vp, \
                off_t oldoff, \
                off_t newoff, \
                struct ucred *cred))) spec_badop)
#define spec_remove ((int (*) __P(( \
                struct nameidata *ndp, \
                struct proc *p))) spec_badop)
#define spec_link ((int (*) __P(( \
                struct vnode *vp, \
                struct nameidata *ndp, \
                struct proc *p))) spec_badop)
#define spec_rename ((int (*) __P(( \
                struct nameidata *fndp, \
                struct nameidata *tdnp, \
                struct proc *p))) spec_badop)
#define spec_mkdir ((int (*) __P(( \
                struct nameidata *ndp, \
                struct vattr *vap, \
                struct proc *p))) spec_badop)
#define spec_rmdir ((int (*) __P(( \
                struct nameidata *ndp, \
                struct proc *p))) spec_badop)
#define spec_symlink ((int (*) __P(( \
                struct nameidata *ndp, \
                struct vattr *vap, \
                char *target, \
                struct proc *p))) spec_badop)
#define spec_readdir ((int (*) __P(( \
                struct vnode *vp, \
                struct uio *uio, \
                struct ucred *cred, \
                int *eofflagp))) spec_badop)
#define spec_readlink ((int (*) __P(( \
                struct vnode *vp, \
                struct uio *uio, \
                struct ucred *cred))) spec_badop)
#define spec_abortop ((int (*) __P(( \
                struct nameidata *ndp))) spec_badop)
#define spec_inactive ((int (*) __P(( \
                struct vnode *vp, \
                struct proc *p))) nullop)
#define spec_reclaim ((int (*) __P(( \
                struct vnode *vp))) nullop)
int     spec_lock __P((
                struct vnode *vp));
int     spec_unlock __P((
                struct vnode *vp));
int     spec_bmap __P((
                struct vnode *vp,
                daddr_t bn,
                struct vnode **vpp,
                daddr_t *bnp));
int     spec_strategy __P((
                struct buf *bp));
int     spec_print __P((
                struct vnode *vp));
#define spec_islocked ((int (*) __P(( \
                struct vnode *vp))) nullop)
int     spec_advlock __P((
                struct vnode *vp,
                caddr_t id,
                int op,
                struct flock *fl,
                int flags));