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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright 2017 Nexenta Systems, Inc. All rights reserved.
*/
/*
* A few excerpts from smb_kutil.c
*/
#include <sys/param.h>
#include <sys/types.h>
#include <sys/atomic.h>
#include <sys/debug.h>
#include <sys/time.h>
#include <sys/stddef.h>
#include <smbsrv/smb_kproto.h>
/*
* smb_llist_constructor
*
* This function initializes a locked list.
*/
void
smb_llist_constructor(
smb_llist_t *ll,
size_t size,
size_t offset)
{
rw_init(&ll->ll_lock, NULL, RW_DEFAULT, NULL);
mutex_init(&ll->ll_mutex, NULL, MUTEX_DEFAULT, NULL);
list_create(&ll->ll_list, size, offset);
list_create(&ll->ll_deleteq, sizeof (smb_dtor_t),
offsetof(smb_dtor_t, dt_lnd));
ll->ll_count = 0;
ll->ll_wrop = 0;
ll->ll_deleteq_count = 0;
ll->ll_flushing = B_FALSE;
}
/*
* Flush the delete queue and destroy a locked list.
*/
void
smb_llist_destructor(
smb_llist_t *ll)
{
/* smb_llist_flush(ll); */
ASSERT(ll->ll_count == 0);
ASSERT(ll->ll_deleteq_count == 0);
rw_destroy(&ll->ll_lock);
list_destroy(&ll->ll_list);
list_destroy(&ll->ll_deleteq);
mutex_destroy(&ll->ll_mutex);
}
void
smb_llist_enter(smb_llist_t *ll, krw_t mode)
{
rw_enter(&ll->ll_lock, mode);
}
/*
* Exit the list lock and process the delete queue.
*/
void
smb_llist_exit(smb_llist_t *ll)
{
rw_exit(&ll->ll_lock);
/* smb_llist_flush(ll); */
}
/*
* smb_llist_upgrade
*
* This function tries to upgrade the lock of the locked list. It assumes the
* locked has already been entered in RW_READER mode. It first tries using the
* Solaris function rw_tryupgrade(). If that call fails the lock is released
* and reentered in RW_WRITER mode. In that last case a window is opened during
* which the contents of the list may have changed. The return code indicates
* whether or not the list was modified when the lock was exited.
*/
int smb_llist_upgrade(
smb_llist_t *ll)
{
uint64_t wrop;
if (rw_tryupgrade(&ll->ll_lock) != 0) {
return (0);
}
wrop = ll->ll_wrop;
rw_exit(&ll->ll_lock);
rw_enter(&ll->ll_lock, RW_WRITER);
return (wrop != ll->ll_wrop);
}
/*
* smb_llist_insert_head
*
* This function inserts the object passed a the beginning of the list. This
* function assumes the lock of the list has already been entered.
*/
void
smb_llist_insert_head(
smb_llist_t *ll,
void *obj)
{
list_insert_head(&ll->ll_list, obj);
++ll->ll_wrop;
++ll->ll_count;
}
/*
* smb_llist_insert_tail
*
* This function appends to the object passed to the list. This function assumes
* the lock of the list has already been entered.
*
*/
void
smb_llist_insert_tail(
smb_llist_t *ll,
void *obj)
{
list_insert_tail(&ll->ll_list, obj);
++ll->ll_wrop;
++ll->ll_count;
}
/*
* smb_llist_remove
*
* This function removes the object passed from the list. This function assumes
* the lock of the list has already been entered.
*/
void
smb_llist_remove(
smb_llist_t *ll,
void *obj)
{
list_remove(&ll->ll_list, obj);
++ll->ll_wrop;
--ll->ll_count;
}
/*
* smb_llist_get_count
*
* This function returns the number of elements in the specified list.
*/
uint32_t
smb_llist_get_count(
smb_llist_t *ll)
{
return (ll->ll_count);
}
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