138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/* $NetBSD: dmover_session.c,v 1.2 2005/02/27 00:26:59 perry Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 2002 Wasabi Systems, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
|
|
*
|
|
* 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 for the NetBSD Project by
|
|
* Wasabi Systems, Inc.
|
|
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
|
|
* or promote products derived from this software without specific prior
|
|
* written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* dmover_session.c: Session management functions for dmover-api.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: dmover_session.c,v 1.2 2005/02/27 00:26:59 perry Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/pool.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/malloc.h>
|
|
|
|
#include <dev/dmover/dmovervar.h>
|
|
|
|
struct pool dmover_session_pool;
|
|
|
|
static int initialized;
|
|
static struct simplelock initialized_slock = SIMPLELOCK_INITIALIZER;
|
|
|
|
void
|
|
dmover_session_initialize(void)
|
|
{
|
|
|
|
simple_lock(&initialized_slock);
|
|
if (__predict_true(initialized == 0)) {
|
|
pool_init(&dmover_session_pool, sizeof(struct dmover_session),
|
|
0, 0, 0, "dmses", &pool_allocator_nointr);
|
|
initialized = 1;
|
|
}
|
|
simple_unlock(&initialized_slock);
|
|
}
|
|
|
|
/*
|
|
* dmover_session_create: [client interface function]
|
|
*
|
|
* Create a dmover session.
|
|
*/
|
|
int
|
|
dmover_session_create(const char *type, struct dmover_session **dsesp)
|
|
{
|
|
struct dmover_session *dses;
|
|
int error;
|
|
|
|
if (__predict_false(initialized == 0)) {
|
|
simple_lock(&initialized_slock);
|
|
error = initialized ? 0 : ENXIO;
|
|
simple_unlock(&initialized_slock);
|
|
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
dses = pool_get(&dmover_session_pool, PR_NOWAIT);
|
|
if (__predict_false(dses == NULL))
|
|
return (ENOMEM);
|
|
|
|
/* Allocate a back-end to the session. */
|
|
error = dmover_backend_alloc(dses, type);
|
|
if (__predict_false(error)) {
|
|
pool_put(&dmover_session_pool, dses);
|
|
return (error);
|
|
}
|
|
|
|
TAILQ_INIT(&dses->__dses_pendreqs);
|
|
dses->__dses_npendreqs = 0;
|
|
|
|
*dsesp = dses;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* dmover_session_destroy: [client interface function]
|
|
*
|
|
* Tear down a dmover session.
|
|
*/
|
|
void
|
|
dmover_session_destroy(struct dmover_session *dses)
|
|
{
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (__predict_false(initialized == 0)) {
|
|
int croak;
|
|
|
|
simple_lock(&initialized_slock);
|
|
croak = (initialized == 0);
|
|
simple_unlock(&initialized_slock);
|
|
|
|
if (croak)
|
|
panic("dmover_session_destroy: not initialized");
|
|
}
|
|
#endif
|
|
|
|
/* XXX */
|
|
if (dses->__dses_npendreqs)
|
|
panic("dmover_session_destroy");
|
|
|
|
dmover_backend_release(dses);
|
|
pool_put(&dmover_session_pool, dses);
|
|
}
|