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_lookup_t     dead_lookup;
    static vop_open_t       dead_open;
    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 =             VOP_EBADF,
            .vop_create =           VOP_PANIC,
            .vop_getattr =          VOP_EBADF,
            .vop_getwritemount =    dead_getwritemount,
            .vop_inactive =         VOP_NULL,
            .vop_ioctl =            VOP_EBADF,
            .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_vptocnp =          VOP_EBADF,
            .vop_write =            dead_write,
    };
    
    static int
    dead_getwritemount(struct vop_getwritemount_args *ap)
    {
    
            *(ap->a_mpp) = NULL;
            return (0);
    }
    
    /*
     * Trivial lookup routine that always fails.
     */
    static int
    dead_lookup(struct vop_lookup_args *ap)
    {
    
            *ap->a_vpp = NULL;
            return (ENOTDIR);
    }
    
    /*
    * Open always fails as if device did not exist.
    */
   static int
   dead_open(struct vop_open_args *ap)
   {
   
           return (ENXIO);
   }
   
   int
   dead_read(struct vop_read_args *ap)
   {
   
           /*
            * Return EOF for tty devices, EIO for others
            */
           if ((ap->a_vp->v_vflag & VV_ISTTY) == 0)
                   return (EIO);
           return (0);
   }
   
   int
   dead_write(struct vop_write_args *ap)
   {
   
           return (EIO);
   }
   
   int
   dead_poll(struct vop_poll_args *ap)
   {
   
           if (ap->a_events & ~POLLSTANDARD)
                   return (POLLNVAL);
   
           /*
            * Let the user find out that the descriptor is gone.
            */
           return (POLLHUP | ((POLLIN | POLLRDNORM) & ap->a_events));
   
   }
   
   static int
   dead_rename(struct vop_rename_args *ap)
   {
   
           vop_rename_fail(ap);
           return (EXDEV);
   }

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