dead_vnops.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1989, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)dead_vnops.c        8.1 (Berkeley) 6/10/93
   32  * $FreeBSD: releng/12.0/sys/fs/deadfs/dead_vnops.c 326023 2017-11-20 19:43:44Z pfg $
   33  */
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/kernel.h>
   38 #include <sys/lock.h>
   39 #include <sys/mutex.h>
   40 #include <sys/poll.h>
   41 #include <sys/vnode.h>
   42 
   43 /*
   44  * Prototypes for dead operations on vnodes.
   45  */
   46 static vop_lookup_t     dead_lookup;
   47 static vop_open_t       dead_open;
   48 static vop_getwritemount_t dead_getwritemount;
   49 static vop_rename_t     dead_rename;
   50 
   51 struct vop_vector dead_vnodeops = {
   52         .vop_default =          &default_vnodeops,
   53 
   54         .vop_access =           VOP_EBADF,
   55         .vop_advlock =          VOP_EBADF,
   56         .vop_bmap =             VOP_EBADF,
   57         .vop_create =           VOP_PANIC,
   58         .vop_getattr =          VOP_EBADF,
   59         .vop_getwritemount =    dead_getwritemount,
   60         .vop_inactive =         VOP_NULL,
   61         .vop_ioctl =            VOP_EBADF,
   62         .vop_link =             VOP_PANIC,
   63         .vop_lookup =           dead_lookup,
   64         .vop_mkdir =            VOP_PANIC,
   65         .vop_mknod =            VOP_PANIC,
   66         .vop_open =             dead_open,
   67         .vop_pathconf =         VOP_EBADF,      /* per pathconf(2) */
   68         .vop_poll =             dead_poll,
   69         .vop_read =             dead_read,
   70         .vop_readdir =          VOP_EBADF,
   71         .vop_readlink =         VOP_EBADF,
   72         .vop_reclaim =          VOP_NULL,
   73         .vop_remove =           VOP_PANIC,
   74         .vop_rename =           dead_rename,
   75         .vop_rmdir =            VOP_PANIC,
   76         .vop_setattr =          VOP_EBADF,
   77         .vop_symlink =          VOP_PANIC,
   78         .vop_vptocnp =          VOP_EBADF,
   79         .vop_write =            dead_write,
   80 };
   81 
   82 static int
   83 dead_getwritemount(struct vop_getwritemount_args *ap)
   84 {
   85 
   86         *(ap->a_mpp) = NULL;
   87         return (0);
   88 }
   89 
   90 /*
   91  * Trivial lookup routine that always fails.
   92  */
   93 static int
   94 dead_lookup(struct vop_lookup_args *ap)
   95 {
   96 
   97         *ap->a_vpp = NULL;
   98         return (ENOTDIR);
   99 }
  100 
  101 /*
  102  * Open always fails as if device did not exist.
  103  */
  104 static int
  105 dead_open(struct vop_open_args *ap)
  106 {
  107 
  108         return (ENXIO);
  109 }
  110 
  111 int
  112 dead_read(struct vop_read_args *ap)
  113 {
  114 
  115         /*
  116          * Return EOF for tty devices, EIO for others
  117          */
  118         if ((ap->a_vp->v_vflag & VV_ISTTY) == 0)
  119                 return (EIO);
  120         return (0);
  121 }
  122 
  123 int
  124 dead_write(struct vop_write_args *ap)
  125 {
  126 
  127         return (EIO);
  128 }
  129 
  130 int
  131 dead_poll(struct vop_poll_args *ap)
  132 {
  133 
  134         if (ap->a_events & ~POLLSTANDARD)
  135                 return (POLLNVAL);
  136 
  137         /*
  138          * Let the user find out that the descriptor is gone.
  139          */
  140         return (POLLHUP | ((POLLIN | POLLRDNORM) & ap->a_events));
  141 
  142 }
  143 
  144 static int
  145 dead_rename(struct vop_rename_args *ap)
  146 {
  147 
  148         vop_rename_fail(ap);
  149         return (EXDEV);
  150 }

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

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