tmpfs_fifoops.c

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    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 #include <sys/cdefs.h>
   37  __FBSDID("$FreeBSD$");
   38 
   39 #include <sys/param.h>
   40 #include <sys/filedesc.h>
   41 #include <sys/proc.h>
   42 #include <sys/vnode.h>
   43 
   44 #include <vm/vm.h>
   45 #include <vm/vm_object.h>
   46 
   47 #include <fs/tmpfs/tmpfs.h>
   48 #include <fs/tmpfs/tmpfs_fifoops.h>
   49 #include <fs/tmpfs/tmpfs_vnops.h>
   50 
   51 /* --------------------------------------------------------------------- */
   52 
   53 static int
   54 tmpfs_fifo_kqfilter(struct vop_kqfilter_args *ap)
   55 {
   56         struct vnode *vp;
   57         struct tmpfs_node *node;
   58 
   59         vp = ap->a_vp;
   60         node = VP_TO_TMPFS_NODE(vp);
   61 
   62         switch (ap->a_kn->kn_filter){
   63         case EVFILT_READ:
   64                 node->tn_status |= TMPFS_NODE_ACCESSED;
   65                 break;
   66         case EVFILT_WRITE:
   67                 node->tn_status |= TMPFS_NODE_MODIFIED;
   68                 break;
   69         }
   70 
   71         return fifo_specops.vop_kqfilter(ap);
   72 }
   73 
   74 /* --------------------------------------------------------------------- */
   75 
   76 static int
   77 tmpfs_fifo_close(struct vop_close_args *v)
   78 {
   79         struct tmpfs_node *node;
   80         node = VP_TO_TMPFS_NODE(v->a_vp);
   81         node->tn_status |= TMPFS_NODE_ACCESSED;
   82 
   83         tmpfs_update(v->a_vp);
   84         return fifo_specops.vop_close(v);
   85 }
   86 
   87 /*
   88  * vnode operations vector used for fifos stored in a tmpfs file system.
   89  */
   90 struct vop_vector tmpfs_fifoop_entries = {
   91         .vop_default =                  &fifo_specops,
   92         .vop_close =                    tmpfs_fifo_close,
   93         .vop_reclaim =                  tmpfs_reclaim,
   94         .vop_access =                   tmpfs_access,
   95         .vop_getattr =                  tmpfs_getattr,
   96         .vop_setattr =                  tmpfs_setattr,
   97         .vop_kqfilter =                 tmpfs_fifo_kqfilter,
   98 };
   99

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FreeBSD/Linux Kernel Cross Reference sys/fs/tmpfs/tmpfs_fifoops.c

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sys/fs/tmpfs/tmpfs_fifoops.c