FreeBSD/Linux Kernel Cross Reference
sys/fs/deadfs/dead_vnops.c

     /*-
      * 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.
     * 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.
     *
     *      @(#)dead_vnops.c        8.1 (Berkeley) 6/10/93
     * $FreeBSD$
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <sys/poll.h>
    #include <sys/vnode.h>
    
    /*
     * Prototypes for dead operations on vnodes.
     */
    static vop_bmap_t       dead_bmap;
    static vop_ioctl_t      dead_ioctl;
    static vop_lookup_t     dead_lookup;
    static vop_open_t       dead_open;
    static vop_poll_t       dead_poll;
    static vop_read_t       dead_read;
    static vop_write_t      dead_write;
    static vop_getwritemount_t dead_getwritemount;
    static vop_rename_t     dead_rename;
    
    struct vop_vector dead_vnodeops = {
            .vop_default =          &default_vnodeops,
    
            .vop_access =           VOP_EBADF,
            .vop_advlock =          VOP_EBADF,
            .vop_bmap =             dead_bmap,
            .vop_create =           VOP_PANIC,
            .vop_getattr =          VOP_EBADF,
            .vop_getwritemount =    dead_getwritemount,
            .vop_inactive =         VOP_NULL,
            .vop_ioctl =            dead_ioctl,
            .vop_link =             VOP_PANIC,
            .vop_lookup =           dead_lookup,
            .vop_mkdir =            VOP_PANIC,
            .vop_mknod =            VOP_PANIC,
            .vop_open =             dead_open,
            .vop_pathconf =         VOP_EBADF,      /* per pathconf(2) */
            .vop_poll =             dead_poll,
            .vop_read =             dead_read,
            .vop_readdir =          VOP_EBADF,
            .vop_readlink =         VOP_EBADF,
            .vop_reclaim =          VOP_NULL,
            .vop_remove =           VOP_PANIC,
            .vop_rename =           dead_rename,
            .vop_rmdir =            VOP_PANIC,
            .vop_setattr =          VOP_EBADF,
            .vop_symlink =          VOP_PANIC,
            .vop_write =            dead_write,
    };
    
    /* ARGSUSED */
    static int
    dead_getwritemount(ap)
            struct vop_getwritemount_args /* {
                    struct vnode *a_vp;
                    struct mount **a_mpp;
            } */ *ap;
    {
            *(ap->a_mpp) = NULL;
            return (0);
    }
    
    /*
     * Trivial lookup routine that always fails.
     */
    /* ARGSUSED */
   static int
   dead_lookup(ap)
           struct vop_lookup_args /* {
                   struct vnode * a_dvp;
                   struct vnode ** a_vpp;
                   struct componentname * a_cnp;
           } */ *ap;
   {
   
           *ap->a_vpp = NULL;
           return (ENOTDIR);
   }
   
   /*
    * Open always fails as if device did not exist.
    */
   /* ARGSUSED */
   static int
   dead_open(ap)
           struct vop_open_args /* {
                   struct vnode *a_vp;
                   int  a_mode;
                   struct ucred *a_cred;
                   struct proc *a_p;
           } */ *ap;
   {
   
           return (ENXIO);
   }
   
   /*
    * Vnode op for read
    */
   /* ARGSUSED */
   static int
   dead_read(ap)
           struct vop_read_args /* {
                   struct vnode *a_vp;
                   struct uio *a_uio;
                   int  a_ioflag;
                   struct ucred *a_cred;
           } */ *ap;
   {
           /*
            * Return EOF for tty devices, EIO for others
            */
           if ((ap->a_vp->v_vflag & VV_ISTTY) == 0)
                   return (EIO);
           return (0);
   }
   
   /*
    * Vnode op for write
    */
   /* ARGSUSED */
   static int
   dead_write(ap)
           struct vop_write_args /* {
                   struct vnode *a_vp;
                   struct uio *a_uio;
                   int  a_ioflag;
                   struct ucred *a_cred;
           } */ *ap;
   {
           return (EIO);
   }
   
   /*
    * Device ioctl operation.
    */
   /* ARGSUSED */
   static int
   dead_ioctl(ap)
           struct vop_ioctl_args /* {
                   struct vnode *a_vp;
                   u_long  a_command;
                   caddr_t  a_data;
                   int  a_fflag;
                   struct ucred *a_cred;
                   struct proc *a_p;
           } */ *ap;
   {
           /* XXX: Doesn't this just recurse back here ? */
           return (VOP_IOCTL_AP(ap));
   }
   
   /*
    * Wait until the vnode has finished changing state.
    */
   static int
   dead_bmap(ap)
           struct vop_bmap_args /* {
                   struct vnode *a_vp;
                   daddr_t  a_bn;
                   struct bufobj **a_bop;
                   daddr_t *a_bnp;
                   int *a_runp;
                   int *a_runb;
           } */ *ap;
   {
   
           return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_bop, ap->a_bnp, ap->a_runp, ap->a_runb));
   }
   
   /*
    * Trivial poll routine that always returns POLLHUP.
    * This is necessary so that a process which is polling a file
    * gets notified when that file is revoke()d.
    */
   static int
   dead_poll(ap)
           struct vop_poll_args *ap;
   {
           return (POLLHUP);
   }
   
   static int
   dead_rename(ap)
           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;
   {
           if (ap->a_tvp)
                   vput(ap->a_tvp);
           if (ap->a_tdvp == ap->a_tvp)
                   vrele(ap->a_tdvp);
           else
                   vput(ap->a_tdvp);
           vrele(ap->a_fdvp);
           vrele(ap->a_fvp);
           return (EXDEV);
   }

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