1219820Sjeff/*- 2219820Sjeff * Copyright (c) 2010 Isilon Systems, Inc. 3219820Sjeff * Copyright (c) 2010 iX Systems, Inc. 4219820Sjeff * Copyright (c) 2010 Panasas, Inc. 5219820Sjeff * All rights reserved. 6219820Sjeff * 7219820Sjeff * Redistribution and use in source and binary forms, with or without 8219820Sjeff * modification, are permitted provided that the following conditions 9219820Sjeff * are met: 10219820Sjeff * 1. Redistributions of source code must retain the above copyright 11219820Sjeff * notice unmodified, this list of conditions, and the following 12219820Sjeff * disclaimer. 13219820Sjeff * 2. Redistributions in binary form must reproduce the above copyright 14219820Sjeff * notice, this list of conditions and the following disclaimer in the 15219820Sjeff * documentation and/or other materials provided with the distribution. 16219820Sjeff * 17219820Sjeff * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18219820Sjeff * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19219820Sjeff * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20219820Sjeff * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21219820Sjeff * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22219820Sjeff * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23219820Sjeff * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24219820Sjeff * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25219820Sjeff * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26219820Sjeff * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27219820Sjeff */ 28219820Sjeff#ifndef _LINUX_KREF_H_ 29219820Sjeff#define _LINUX_KREF_H_ 30219820Sjeff 31219820Sjeff#include <sys/refcount.h> 32219820Sjeff 33219820Sjeffstruct kref { 34219820Sjeff volatile u_int count; 35219820Sjeff}; 36219820Sjeff 37219820Sjeffstatic inline void 38219820Sjeffkref_init(struct kref *kref) 39219820Sjeff{ 40219820Sjeff 41219820Sjeff refcount_init(&kref->count, 1); 42219820Sjeff} 43219820Sjeff 44219820Sjeffstatic inline void 45219820Sjeffkref_get(struct kref *kref) 46219820Sjeff{ 47219820Sjeff 48219820Sjeff refcount_acquire(&kref->count); 49219820Sjeff} 50219820Sjeff 51219820Sjeffstatic inline int 52219820Sjeffkref_put(struct kref *kref, void (*rel)(struct kref *kref)) 53219820Sjeff{ 54219820Sjeff 55219820Sjeff if (refcount_release(&kref->count)) { 56219820Sjeff rel(kref); 57219820Sjeff return 1; 58219820Sjeff } 59219820Sjeff return 0; 60219820Sjeff} 61219820Sjeff 62219820Sjeff#endif /* _KREF_H_ */ 63