kref.h

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    1 /*-
    2  * Copyright (c) 2010 Isilon Systems, Inc.
    3  * Copyright (c) 2010 iX Systems, Inc.
    4  * Copyright (c) 2010 Panasas, Inc.
    5  * Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
    6  * Copyright (c) 2013 François Tigeot
    7  * All rights reserved.
    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 unmodified, this list of conditions, and the following
   14  *    disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29  *
   30  * $FreeBSD$
   31  */
   32 #ifndef _LINUXKPI_LINUX_KREF_H_
   33 #define _LINUXKPI_LINUX_KREF_H_
   34 
   35 #include <sys/types.h>
   36 #include <sys/refcount.h>
   37 
   38 #include <linux/compiler.h>
   39 #include <linux/kernel.h>
   40 #include <linux/mutex.h>
   41 #include <linux/refcount.h>
   42 
   43 #include <asm/atomic.h>
   44 
   45 struct kref {
   46         /* XXX In Linux this is a refcount_t */
   47         atomic_t refcount;
   48 };
   49 
   50 static inline void
   51 kref_init(struct kref *kref)
   52 {
   53 
   54         refcount_init((uint32_t *)&kref->refcount, 1);
   55 }
   56 
   57 static inline unsigned int
   58 kref_read(const struct kref *kref)
   59 {
   60 
   61         return (refcount_load(__DECONST(u_int32_t *, &kref->refcount)));
   62 }
   63 
   64 static inline void
   65 kref_get(struct kref *kref)
   66 {
   67 
   68         refcount_acquire((uint32_t *)&kref->refcount);
   69 }
   70 
   71 static inline int
   72 kref_put(struct kref *kref, void (*rel)(struct kref *kref))
   73 {
   74 
   75         if (refcount_release((uint32_t *)&kref->refcount)) {
   76                 rel(kref);
   77                 return 1;
   78         }
   79         return 0;
   80 }
   81 
   82 static inline int
   83 kref_put_lock(struct kref *kref, void (*rel)(struct kref *kref),
   84     spinlock_t *lock)
   85 {
   86 
   87         if (refcount_release((uint32_t *)&kref->refcount)) {
   88                 spin_lock(lock);
   89                 rel(kref);
   90                 return (1);
   91         }
   92         return (0);
   93 }
   94 
   95 static inline int
   96 kref_sub(struct kref *kref, unsigned int count,
   97     void (*rel)(struct kref *kref))
   98 {
   99 
  100         while (count--) {
  101                 if (refcount_release((uint32_t *)&kref->refcount)) {
  102                         rel(kref);
  103                         return 1;
  104                 }
  105         }
  106         return 0;
  107 }
  108 
  109 static inline int __must_check
  110 kref_get_unless_zero(struct kref *kref)
  111 {
  112 
  113         return refcount_acquire_if_not_zero((uint32_t *)&kref->refcount);
  114 }
  115 
  116 static inline int kref_put_mutex(struct kref *kref,
  117     void (*release)(struct kref *kref), struct mutex *lock)
  118 {
  119         WARN_ON(release == NULL);
  120         if (unlikely(!refcount_release_if_not_last((uint32_t *)&kref->refcount))) {
  121                 mutex_lock(lock);
  122                 if (unlikely(!refcount_release((uint32_t *)&kref->refcount))) {
  123                         mutex_unlock(lock);
  124                         return 0;
  125                 }
  126                 release(kref);
  127                 return 1;
  128         }
  129         return 0;
  130 }
  131 
  132 #endif /* _LINUXKPI_LINUX_KREF_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/compat/linuxkpi/common/include/linux/kref.h

FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/kref.h