sys/vfs/tmpfs/tmpfs_fifoops.c

   1 /*      $NetBSD: tmpfs_fifoops.c,v 1.5 2005/12/11 12:24:29 christos Exp $       */
   2
   3 /*-
   4  * Copyright (c) 2005 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
   9  * 2005 program.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * tmpfs vnode interface for named pipes.
  35  */
  36
  37 #include <sys/kernel.h>
  38 #include <sys/param.h>
  39 #include <sys/filedesc.h>
  40 #include <sys/proc.h>
  41 #include <sys/vnode.h>
  42
  43 #include <vm/vm.h>
  44 #include <vm/vm_object.h>
  45
  46 #include <vfs/fifofs/fifo.h>
  47 #include <vfs/tmpfs/tmpfs.h>
  48 #include <vfs/tmpfs/tmpfs_vnops.h>
  49
  50 /* --------------------------------------------------------------------- */
  51
  52 static int
  53 tmpfs_fifo_kqfilter(struct vop_kqfilter_args *ap)
  54 {
  55         struct vnode *vp;
  56         struct tmpfs_node *node;
  57
  58         vp = ap->a_vp;
  59         node = VP_TO_TMPFS_NODE(vp);
  60
  61         switch (ap->a_kn->kn_filter){
  62         case EVFILT_READ:
  63                 node->tn_status |= TMPFS_NODE_ACCESSED;
  64                 break;
  65         case EVFILT_WRITE:
  66                 node->tn_status |= TMPFS_NODE_MODIFIED;
  67                 break;
  68         }
  69
  70         return fifo_vnode_vops.vop_kqfilter(ap);
  71 }
  72
  73 /* --------------------------------------------------------------------- */
  74
  75 static int
  76 tmpfs_fifo_close(struct vop_close_args *ap)
  77 {
  78         struct tmpfs_node *node;
  79         node = VP_TO_TMPFS_NODE(ap->a_vp);
  80         node->tn_status |= TMPFS_NODE_ACCESSED;
  81
  82         tmpfs_update(ap->a_vp);
  83         return fifo_vnode_vops.vop_close(ap);
  84 }
  85
  86 /*
  87  * vnode operations vector used for fifos stored in a tmpfs file system.
  88  */
  89 struct vop_ops tmpfs_fifo_vops = {
  90         .vop_default =                  fifo_vnoperate,
  91         .vop_close =                    tmpfs_fifo_close,
  92         .vop_reclaim =                  tmpfs_reclaim,
  93         .vop_access =                   tmpfs_access,
  94         .vop_getattr =                  tmpfs_getattr,
  95         .vop_setattr =                  tmpfs_setattr,
  96         .vop_kqfilter =                 tmpfs_fifo_kqfilter,
  97 };