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  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)dead_vnops.c        8.1 (Berkeley) 6/10/93
   30  * $FreeBSD: releng/8.4/sys/fs/deadfs/dead_vnops.c 240745 2012-09-20 10:28:44Z kib $
   31  */
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/kernel.h>
   36 #include <sys/lock.h>
   37 #include <sys/mutex.h>
   38 #include <sys/poll.h>
   39 #include <sys/vnode.h>
   40 
   41 /*
   42  * Prototypes for dead operations on vnodes.
   43  */
   44 static vop_lookup_t     dead_lookup;
   45 static vop_open_t       dead_open;
   46 static vop_poll_t       dead_poll;
   47 static vop_read_t       dead_read;
   48 static vop_write_t      dead_write;
   49 static vop_getwritemount_t dead_getwritemount;
   50 static vop_rename_t     dead_rename;
   51 
   52 struct vop_vector dead_vnodeops = {
   53         .vop_default =          &default_vnodeops,
   54 
   55         .vop_access =           VOP_EBADF,
   56         .vop_advlock =          VOP_EBADF,
   57         .vop_bmap =             VOP_EBADF,
   58         .vop_create =           VOP_PANIC,
   59         .vop_getattr =          VOP_EBADF,
   60         .vop_getwritemount =    dead_getwritemount,
   61         .vop_inactive =         VOP_NULL,
   62         .vop_ioctl =            VOP_EBADF,
   63         .vop_link =             VOP_PANIC,
   64         .vop_lookup =           dead_lookup,
   65         .vop_mkdir =            VOP_PANIC,
   66         .vop_mknod =            VOP_PANIC,
   67         .vop_open =             dead_open,
   68         .vop_pathconf =         VOP_EBADF,      /* per pathconf(2) */
   69         .vop_poll =             dead_poll,
   70         .vop_read =             dead_read,
   71         .vop_readdir =          VOP_EBADF,
   72         .vop_readlink =         VOP_EBADF,
   73         .vop_reclaim =          VOP_NULL,
   74         .vop_remove =           VOP_PANIC,
   75         .vop_rename =           dead_rename,
   76         .vop_rmdir =            VOP_PANIC,
   77         .vop_setattr =          VOP_EBADF,
   78         .vop_symlink =          VOP_PANIC,
   79         .vop_vptocnp =          VOP_EBADF,
   80         .vop_write =            dead_write,
   81 };
   82 
   83 /* ARGSUSED */
   84 static int
   85 dead_getwritemount(ap)
   86         struct vop_getwritemount_args /* {
   87                 struct vnode *a_vp;
   88                 struct mount **a_mpp;
   89         } */ *ap;
   90 {
   91         *(ap->a_mpp) = NULL;
   92         return (0);
   93 }
   94 
   95 /*
   96  * Trivial lookup routine that always fails.
   97  */
   98 /* ARGSUSED */
   99 static int
  100 dead_lookup(ap)
  101         struct vop_lookup_args /* {
  102                 struct vnode * a_dvp;
  103                 struct vnode ** a_vpp;
  104                 struct componentname * a_cnp;
  105         } */ *ap;
  106 {
  107 
  108         *ap->a_vpp = NULL;
  109         return (ENOTDIR);
  110 }
  111 
  112 /*
  113  * Open always fails as if device did not exist.
  114  */
  115 /* ARGSUSED */
  116 static int
  117 dead_open(ap)
  118         struct vop_open_args /* {
  119                 struct vnode *a_vp;
  120                 int  a_mode;
  121                 struct ucred *a_cred;
  122                 struct proc *a_p;
  123         } */ *ap;
  124 {
  125 
  126         return (ENXIO);
  127 }
  128 
  129 /*
  130  * Vnode op for read
  131  */
  132 /* ARGSUSED */
  133 static int
  134 dead_read(ap)
  135         struct vop_read_args /* {
  136                 struct vnode *a_vp;
  137                 struct uio *a_uio;
  138                 int  a_ioflag;
  139                 struct ucred *a_cred;
  140         } */ *ap;
  141 {
  142         /*
  143          * Return EOF for tty devices, EIO for others
  144          */
  145         if ((ap->a_vp->v_vflag & VV_ISTTY) == 0)
  146                 return (EIO);
  147         return (0);
  148 }
  149 
  150 /*
  151  * Vnode op for write
  152  */
  153 /* ARGSUSED */
  154 static int
  155 dead_write(ap)
  156         struct vop_write_args /* {
  157                 struct vnode *a_vp;
  158                 struct uio *a_uio;
  159                 int  a_ioflag;
  160                 struct ucred *a_cred;
  161         } */ *ap;
  162 {
  163         return (EIO);
  164 }
  165 
  166 /*
  167  * Trivial poll routine that always returns POLLHUP.
  168  * This is necessary so that a process which is polling a file
  169  * gets notified when that file is revoke()d.
  170  */
  171 static int
  172 dead_poll(ap)
  173         struct vop_poll_args *ap;
  174 {
  175         return (POLLHUP);
  176 }
  177 
  178 static int
  179 dead_rename(ap)
  180         struct vop_rename_args  /* {
  181                 struct vnode *a_fdvp;
  182                 struct vnode *a_fvp;
  183                 struct componentname *a_fcnp;
  184                 struct vnode *a_tdvp;
  185                 struct vnode *a_tvp;
  186                 struct componentname *a_tcnp;
  187         } */ *ap;
  188 {
  189 
  190         vop_rename_fail(ap);
  191         return (EXDEV);
  192 }

Cache object: 49bd5408972de740df4bba9303a677a1


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