The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/deadfs/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  * $FreeBSD$
   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_close_t      dead_close;
   49 static vop_getwritemount_t dead_getwritemount;
   50 static vop_rename_t     dead_rename;
   51 static vop_unset_text_t dead_unset_text;
   52 
   53 struct vop_vector dead_vnodeops = {
   54         .vop_default =          &default_vnodeops,
   55 
   56         .vop_access =           VOP_EBADF,
   57         .vop_advlock =          VOP_EBADF,
   58         .vop_bmap =             VOP_EBADF,
   59         .vop_close =            dead_close,
   60         .vop_create =           VOP_PANIC,
   61         .vop_getattr =          VOP_EBADF,
   62         .vop_getwritemount =    dead_getwritemount,
   63         .vop_inactive =         VOP_NULL,
   64         .vop_ioctl =            VOP_EBADF,
   65         .vop_link =             VOP_PANIC,
   66         .vop_lookup =           dead_lookup,
   67         .vop_mkdir =            VOP_PANIC,
   68         .vop_mknod =            VOP_PANIC,
   69         .vop_open =             dead_open,
   70         .vop_pathconf =         VOP_EBADF,      /* per pathconf(2) */
   71         .vop_poll =             dead_poll,
   72         .vop_read =             dead_read,
   73         .vop_readdir =          VOP_EBADF,
   74         .vop_readlink =         VOP_EBADF,
   75         .vop_reclaim =          VOP_NULL,
   76         .vop_remove =           VOP_PANIC,
   77         .vop_rename =           dead_rename,
   78         .vop_rmdir =            VOP_PANIC,
   79         .vop_setattr =          VOP_EBADF,
   80         .vop_symlink =          VOP_PANIC,
   81         .vop_vptocnp =          VOP_EBADF,
   82         .vop_unset_text =       dead_unset_text,
   83         .vop_write =            dead_write,
   84         .vop_fplookup_vexec =   VOP_EOPNOTSUPP,
   85         .vop_fplookup_symlink = VOP_EAGAIN,
   86 };
   87 VFS_VOP_VECTOR_REGISTER(dead_vnodeops);
   88 
   89 static int
   90 dead_getwritemount(struct vop_getwritemount_args *ap)
   91 {
   92 
   93         *(ap->a_mpp) = NULL;
   94         return (0);
   95 }
   96 
   97 /*
   98  * Trivial lookup routine that always fails.
   99  */
  100 static int
  101 dead_lookup(struct vop_lookup_args *ap)
  102 {
  103 
  104         *ap->a_vpp = NULL;
  105         return (ENOTDIR);
  106 }
  107 
  108 /*
  109  * Silently succeed open and close.
  110  */
  111 static int
  112 dead_open(struct vop_open_args *ap)
  113 {
  114         return (0);
  115 }
  116 
  117 static int
  118 dead_close(struct vop_close_args *ap)
  119 {
  120         return (0);
  121 }
  122 
  123 int
  124 dead_read(struct vop_read_args *ap)
  125 {
  126 
  127         /*
  128          * Return EOF for tty devices, EIO for others
  129          */
  130         if ((ap->a_vp->v_vflag & VV_ISTTY) == 0)
  131                 return (EIO);
  132         return (0);
  133 }
  134 
  135 int
  136 dead_write(struct vop_write_args *ap)
  137 {
  138 
  139         return (EIO);
  140 }
  141 
  142 int
  143 dead_poll(struct vop_poll_args *ap)
  144 {
  145 
  146         if (ap->a_events & ~POLLSTANDARD)
  147                 return (POLLNVAL);
  148 
  149         /*
  150          * Let the user find out that the descriptor is gone.
  151          */
  152         return (POLLHUP | ((POLLIN | POLLRDNORM) & ap->a_events));
  153 
  154 }
  155 
  156 static int
  157 dead_rename(struct vop_rename_args *ap)
  158 {
  159 
  160         vop_rename_fail(ap);
  161         return (EXDEV);
  162 }
  163 
  164 static int
  165 dead_unset_text(struct vop_unset_text_args *ap)
  166 {
  167 
  168         return (0);
  169 }

Cache object: 908f95332002e13c4940ede8fa0cf2e4


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