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/dev/dmover/dmover_session.c

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    1 /*      $NetBSD: dmover_session.c,v 1.5 2008/01/04 21:17:52 ad Exp $    */
    2 
    3 /*
    4  * Copyright (c) 2002 Wasabi Systems, Inc.
    5  * All rights reserved.
    6  *
    7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. All advertising materials mentioning features or use of this software
   18  *    must display the following acknowledgement:
   19  *      This product includes software developed for the NetBSD Project by
   20  *      Wasabi Systems, Inc.
   21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
   22  *    or promote products derived from this software without specific prior
   23  *    written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
   29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   35  * POSSIBILITY OF SUCH DAMAGE.
   36  */
   37 
   38 /*
   39  * dmover_session.c: Session management functions for dmover-api.
   40  */
   41 
   42 #include <sys/cdefs.h>
   43 __KERNEL_RCSID(0, "$NetBSD: dmover_session.c,v 1.5 2008/01/04 21:17:52 ad Exp $");
   44 
   45 #include <sys/param.h>
   46 #include <sys/simplelock.h>
   47 #include <sys/pool.h>
   48 #include <sys/systm.h>
   49 #include <sys/malloc.h>
   50 
   51 #include <dev/dmover/dmovervar.h>
   52 
   53 struct pool dmover_session_pool;
   54 
   55 static int initialized;
   56 static struct simplelock initialized_slock = SIMPLELOCK_INITIALIZER;
   57 
   58 void
   59 dmover_session_initialize(void)
   60 {
   61 
   62         simple_lock(&initialized_slock);
   63         if (__predict_true(initialized == 0)) {
   64                 pool_init(&dmover_session_pool, sizeof(struct dmover_session),
   65                     0, 0, 0, "dmses", &pool_allocator_nointr, IPL_NONE);
   66                 initialized = 1;
   67         }
   68         simple_unlock(&initialized_slock);
   69 }
   70 
   71 /*
   72  * dmover_session_create:       [client interface function]
   73  *
   74  *      Create a dmover session.
   75  */
   76 int
   77 dmover_session_create(const char *type, struct dmover_session **dsesp)
   78 {
   79         struct dmover_session *dses;
   80         int error;
   81 
   82         if (__predict_false(initialized == 0)) {
   83                 simple_lock(&initialized_slock);
   84                 error = initialized ? 0 : ENXIO;
   85                 simple_unlock(&initialized_slock);
   86 
   87                 if (error)
   88                         return (error);
   89         }
   90 
   91         dses = pool_get(&dmover_session_pool, PR_NOWAIT);
   92         if (__predict_false(dses == NULL))
   93                 return (ENOMEM);
   94 
   95         /* Allocate a back-end to the session. */
   96         error = dmover_backend_alloc(dses, type);
   97         if (__predict_false(error)) {
   98                 pool_put(&dmover_session_pool, dses);
   99                 return (error);
  100         }
  101 
  102         TAILQ_INIT(&dses->__dses_pendreqs);
  103         dses->__dses_npendreqs = 0;
  104 
  105         *dsesp = dses;
  106         return (0);
  107 }
  108 
  109 /*
  110  * dmover_session_destroy:      [client interface function]
  111  *
  112  *      Tear down a dmover session.
  113  */
  114 void
  115 dmover_session_destroy(struct dmover_session *dses)
  116 {
  117 
  118 #ifdef DIAGNOSTIC
  119         if (__predict_false(initialized == 0)) {
  120                 int croak;
  121 
  122                 simple_lock(&initialized_slock);
  123                 croak = (initialized == 0);
  124                 simple_unlock(&initialized_slock);
  125 
  126                 if (croak)
  127                         panic("dmover_session_destroy: not initialized");
  128         }
  129 #endif
  130 
  131         /* XXX */
  132         if (dses->__dses_npendreqs)
  133                 panic("dmover_session_destroy");
  134 
  135         dmover_backend_release(dses);
  136         pool_put(&dmover_session_pool, dses);
  137 }

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