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

     /*      $NetBSD: tmpfs_fifoops.c,v 1.5 2005/12/11 12:24:29 christos Exp $       */
     
     /*
      * Copyright (c) 2005 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
      * 2005 program.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *        This product includes software developed by the NetBSD
     *        Foundation, Inc. and its contributors.
     * 4. Neither the name of The NetBSD Foundation nor the names of its
     *    contributors may be used to endorse or promote products derived
     *    from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    /*
     * tmpfs vnode interface for named pipes.
     */
    #include <sys/cdefs.h>
     __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/filedesc.h>
    #include <sys/proc.h>
    #include <sys/vnode.h>
    
    #include <vm/vm.h>
    #include <vm/vm_object.h>
    
    #include <fs/tmpfs/tmpfs.h>
    #include <fs/tmpfs/tmpfs_fifoops.h>
    #include <fs/tmpfs/tmpfs_vnops.h>
    
    /* --------------------------------------------------------------------- */
    
    static int
    tmpfs_fifo_kqfilter(struct vop_kqfilter_args *ap)
    {
            struct vnode *vp;
            struct tmpfs_node *node;
    
            vp = ap->a_vp;
            node = VP_TO_TMPFS_NODE(vp);
    
            switch (ap->a_kn->kn_filter){
            case EVFILT_READ:
                    node->tn_status |= TMPFS_NODE_ACCESSED;
                    break;
            case EVFILT_WRITE:
                    node->tn_status |= TMPFS_NODE_MODIFIED;
                    break;
            }
    
            return fifo_specops.vop_kqfilter(ap);
    }
    
    /* --------------------------------------------------------------------- */
    
    static int
    tmpfs_fifo_close(struct vop_close_args *v)
    {
            struct tmpfs_node *node;
            node = VP_TO_TMPFS_NODE(v->a_vp);
            node->tn_status |= TMPFS_NODE_ACCESSED;
    
            tmpfs_update(v->a_vp);
            return fifo_specops.vop_close(v);
    }
    
    /*
     * vnode operations vector used for fifos stored in a tmpfs file system.
     */
    struct vop_vector tmpfs_fifoop_entries = {
            .vop_default =                  &fifo_specops,
            .vop_close =                    tmpfs_fifo_close,
           .vop_reclaim =                  tmpfs_reclaim,
           .vop_access =                   tmpfs_access,
           .vop_getattr =                  tmpfs_getattr,
           .vop_setattr =                  tmpfs_setattr,
           .vop_kqfilter =                 tmpfs_fifo_kqfilter,
   };
   

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