/*      $NetBSD: dead_vnops.c,v 1.67 2022/10/26 23:39:43 riastradh Exp $        */

/*
 * Copyright (c) 1989, 1993
 *      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. 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.
 *
 *      @(#)dead_vnops.c        8.2 (Berkeley) 11/21/94
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: dead_vnops.c,v 1.67 2022/10/26 23:39:43 riastradh Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/vnode.h>
#include <sys/errno.h>
#include <sys/namei.h>
#include <sys/buf.h>
#include <sys/proc.h>

#include <miscfs/deadfs/deadfs.h>
#include <miscfs/genfs/genfs.h>

/*
 * Prototypes for dead operations on vnodes.
 */
int     dead_lookup(void *);
int     dead_open(void *);
int     dead_read(void *);
int     dead_write(void *);
int     dead_ioctl(void *);
int     dead_poll(void *);
int     dead_remove(void *);
int     dead_link(void *);
int     dead_rename(void *);
int     dead_rmdir(void *);
int     dead_inactive(void *);
int     dead_bmap(void *);
int     dead_strategy(void *);
int     dead_print(void *);
int     dead_getpages(void *);
int     dead_putpages(void *);

int     dead_default_error(void *);

int (**dead_vnodeop_p)(void *);

static const struct vnodeopv_entry_desc dead_vnodeop_entries[] = {
        { &vop_default_desc, dead_default_error },
        { &vop_bwrite_desc, vn_bwrite },                /* bwrite */
        { &vop_parsepath_desc, genfs_parsepath },       /* parsepath */
        { &vop_lookup_desc, dead_lookup },              /* lookup */
        { &vop_open_desc, dead_open },                  /* open */
        { &vop_close_desc, genfs_nullop },              /* close */
        { &vop_read_desc, dead_read },                  /* read */
        { &vop_write_desc, dead_write },                /* write */
        { &vop_fallocate_desc, genfs_eopnotsupp },      /* fallocate */
        { &vop_fdiscard_desc, genfs_eopnotsupp },       /* fdiscard */
        { &vop_fcntl_desc, genfs_nullop },              /* fcntl */
        { &vop_ioctl_desc, dead_ioctl },                /* ioctl */
        { &vop_poll_desc, dead_poll },                  /* poll */
        { &vop_remove_desc, dead_remove },              /* remove */
        { &vop_link_desc, dead_link },                  /* link */
        { &vop_rename_desc, dead_rename },              /* rename */
        { &vop_rmdir_desc, dead_rmdir },                /* rmdir */
        { &vop_fsync_desc, genfs_nullop },              /* fsync */
        { &vop_seek_desc, genfs_nullop },               /* seek */
        { &vop_inactive_desc, dead_inactive },          /* inactive */
        { &vop_reclaim_desc, genfs_nullop },            /* reclaim */
        { &vop_lock_desc, genfs_deadlock },             /* lock */
        { &vop_unlock_desc, genfs_deadunlock },         /* unlock */
        { &vop_bmap_desc, dead_bmap },                  /* bmap */
        { &vop_strategy_desc, dead_strategy },          /* strategy */
        { &vop_print_desc, dead_print },                /* print */
        { &vop_islocked_desc, genfs_deadislocked },     /* islocked */
        { &vop_revoke_desc, genfs_nullop },             /* revoke */
        { &vop_getpages_desc, dead_getpages },          /* getpages */
        { &vop_putpages_desc, dead_putpages },          /* putpages */
        { NULL, NULL }
};
const struct vnodeopv_desc dead_vnodeop_opv_desc =
        { &dead_vnodeop_p, dead_vnodeop_entries };

/* ARGSUSED */
int
dead_default_error(void *v)
{

        return EBADF;
}

int
dead_bmap(void *v)
{
        struct vop_bmap_args /* {
                struct vnode *a_vp;
                daddr_t  a_bn;
                struct vnode **a_vpp;
                daddr_t *a_bnp;
                int *a_runp;
        } */ *ap = v;

        (void)ap;

        return (EIO);
}

int
dead_lookup(void *v)
{
        struct vop_lookup_v2_args /* {
                struct vnode *a_dvp;
                struct vnode **a_vpp;
                struct componentname *a_cnp;
        } */ *ap = v;

        *(ap->a_vpp) = NULL;

        return ENOENT;
}

int
dead_open(void *v)
{
        struct vop_open_args /* {
                struct vnode *a_vp;
                int a_mode;
                kauth_cred_t a_cred;
        } */ *ap = v;

        (void)ap;

        return (ENXIO);
}

int
dead_read(void *v)
{
        struct vop_read_args /* {
                struct vnode *a_vp;
                struct uio *a_uio;
                int  a_ioflag;
                kauth_cred_t a_cred;
        } */ *ap = v;

        /*
         * Return EOF for tty devices, EIO for others
         */
        if ((ap->a_vp->v_vflag & VV_ISTTY) == 0)
                return (EIO);
        return (0);
}

int
dead_write(void *v)
{
        struct vop_write_args /* {
                struct vnode *a_vp;
                struct uio *a_uio;
                int  a_ioflag;
                kauth_cred_t a_cred;
        } */ *ap = v;

        (void)ap;

        return (EIO);
}

int
dead_ioctl(void *v)
{
        struct vop_ioctl_args /* {
                struct vnode *a_vp;
                u_long a_command;
                void *a_data;
                int  a_fflag;
                kauth_cred_t a_cred;
                struct lwp *a_l;
        } */ *ap = v;

        (void)ap;

        return (EBADF);
}

int
dead_poll(void *v)
{
        struct vop_poll_args /* {
                struct vnode *a_vp;
                int a_events;
                struct lwp *a_l;
        } */ *ap = v;

        /*
         * Let the user find out that the descriptor is gone.
         */
        return (ap->a_events);
}

int
dead_remove(void *v)
{
        struct vop_remove_v3_args /* {
                struct vnode *a_dvp;
                struct vnode *a_vp;
                struct componentname *a_cnp;
                nlink_t ctx_vp_new_nlink;
        } */ *ap = v;

        vput(ap->a_vp);

        return EIO;
}

int
dead_link(void *v)
{
        struct vop_link_v2_args /* {
                struct vnode *a_dvp;
                struct vnode *a_vp;
                struct componentname *a_cnp;
        } */ *ap = v;

        (void)ap;

        return EIO;
}

int
dead_rename(void *v)
{
        struct vop_rename_args /* {
                struct vnode *a_fdvp;
                struct vnode *a_fvp;
                struct componentname *a_fcnp;
                struct vnode *a_tdvp;
                struct vnode *a_tvp;
                struct componentname *a_tcnp;
        } */ *ap = v;

        vrele(ap->a_fdvp);
        vrele(ap->a_fvp);
        if (ap->a_tvp != NULL && ap->a_tvp != ap->a_tdvp)
                VOP_UNLOCK(ap->a_tvp);
        vput(ap->a_tdvp);
        if (ap->a_tvp != NULL)
                vrele(ap->a_tvp);

        return EIO;
}

int
dead_rmdir(void *v)
{
        struct vop_rmdir_v2_args /* {
                struct vnode *a_dvp;
                struct vnode *a_vp;
                struct componentname *a_cnp;
        } */ *ap = v;

        vput(ap->a_vp);

        return EIO;
}

int
dead_inactive(void *v)
{
        struct vop_inactive_v2_args /* {
                struct vnode *a_vp;
                bool *a_recycle;
        } */ *ap = v;

        *ap->a_recycle = false;

        return 0;
}

int
dead_strategy(void *v)
{
        struct vop_strategy_args /* {
                struct vnode *a_vp;
                struct buf *a_bp;
        } */ *ap = v;
        struct buf *bp;

        bp = ap->a_bp;
        bp->b_error = EIO;
        bp->b_resid = bp->b_bcount;
        biodone(ap->a_bp);
        return (EIO);
}

/* ARGSUSED */
int
dead_print(void *v)
{
        printf("tag VT_NON, dead vnode\n");
        return 0;
}

int
dead_getpages(void *v)
{
        struct vop_getpages_args /* {
                struct vnode *a_vp;
                voff_t a_offset;
                struct vm_page **a_m;
                int *a_count;
                int a_centeridx;
                vm_prot_t a_access_type;
                int a_advice;
                int a_flags;
        } */ *ap = v;

        if ((ap->a_flags & PGO_LOCKED) == 0)
                rw_exit(ap->a_vp->v_uobj.vmobjlock);

        return (EFAULT);
}

int
dead_putpages(void *v)
{
        struct vop_putpages_args /* {
                struct vnode *a_vp;
                voff_t a_offlo;
                voff_t a_offhi;
                int a_flags;
        } */ *ap = v;

        rw_exit(ap->a_vp->v_uobj.vmobjlock);
        return (EFAULT);
}