1219820Sjeff/*- 2219820Sjeff * Copyright (c) 2010 Isilon Systems, Inc. 3219820Sjeff * Copyright (c) 2010 iX Systems, Inc. 4219820Sjeff * Copyright (c) 2010 Panasas, Inc. 5271127Shselasky * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd. 6219820Sjeff * All rights reserved. 7219820Sjeff * 8219820Sjeff * Redistribution and use in source and binary forms, with or without 9219820Sjeff * modification, are permitted provided that the following conditions 10219820Sjeff * are met: 11219820Sjeff * 1. Redistributions of source code must retain the above copyright 12219820Sjeff * notice unmodified, this list of conditions, and the following 13219820Sjeff * disclaimer. 14219820Sjeff * 2. Redistributions in binary form must reproduce the above copyright 15219820Sjeff * notice, this list of conditions and the following disclaimer in the 16219820Sjeff * documentation and/or other materials provided with the distribution. 17219820Sjeff * 18219820Sjeff * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19219820Sjeff * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20219820Sjeff * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21219820Sjeff * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22219820Sjeff * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23219820Sjeff * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24219820Sjeff * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25219820Sjeff * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26219820Sjeff * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27219820Sjeff * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28219820Sjeff */ 29219820Sjeff#ifndef _LINUX_KREF_H_ 30219820Sjeff#define _LINUX_KREF_H_ 31219820Sjeff 32282513Shselasky#include <sys/types.h> 33219820Sjeff#include <sys/refcount.h> 34219820Sjeff 35219820Sjeffstruct kref { 36219820Sjeff volatile u_int count; 37219820Sjeff}; 38219820Sjeff 39219820Sjeffstatic inline void 40219820Sjeffkref_init(struct kref *kref) 41219820Sjeff{ 42219820Sjeff 43219820Sjeff refcount_init(&kref->count, 1); 44219820Sjeff} 45219820Sjeff 46219820Sjeffstatic inline void 47219820Sjeffkref_get(struct kref *kref) 48219820Sjeff{ 49219820Sjeff 50219820Sjeff refcount_acquire(&kref->count); 51219820Sjeff} 52219820Sjeff 53219820Sjeffstatic inline int 54219820Sjeffkref_put(struct kref *kref, void (*rel)(struct kref *kref)) 55219820Sjeff{ 56219820Sjeff 57219820Sjeff if (refcount_release(&kref->count)) { 58219820Sjeff rel(kref); 59219820Sjeff return 1; 60219820Sjeff } 61219820Sjeff return 0; 62219820Sjeff} 63219820Sjeff 64271127Shselasky#endif /* _LINUX_KREF_H_ */ 65