The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/idr.h

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    1 /*
    2  * Copyright (c) 2005-2012 The DragonFly Project.
    3  * Copyright (c) 2013 François Tigeot
    4  * All rights reserved.
    5  *
    6  * This code is derived from software contributed to The DragonFly Project
    7  * by Jeffrey Hsu.
    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  *
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in
   17  *    the documentation and/or other materials provided with the
   18  *    distribution.
   19  * 3. Neither the name of The DragonFly Project nor the names of its
   20  *    contributors may be used to endorse or promote products derived
   21  *    from this software without specific, prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   24  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   25  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   26  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
   27  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   28  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
   29  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   30  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   31  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   32  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   33  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  */
   37 
   38 /**
   39  * IDR is a small Integer ID management library that provides an interface to
   40  * map integers with some pointer that can later be retrieved.
   41  *
   42  * NOTE: Pointer mapped by integer can't be NULL.
   43  *
   44  */
   45 
   46 
   47 #ifndef _IDR_H_
   48 #define _IDR_H_
   49 
   50 #ifdef _KERNEL
   51 
   52 #include <sys/thread.h>
   53 
   54 #ifndef GFP_KERNEL
   55 #include <sys/malloc.h>
   56 #define GFP_KERNEL      M_WAITOK
   57 #endif
   58 
   59 struct idr_node {
   60         void    *data;
   61         int      allocated;
   62 };
   63 
   64 struct idr {
   65         struct      idr_node *idr_nodes;
   66         int         idr_count;
   67         int         idr_lastindex;
   68         int         idr_freeindex;
   69         int         idr_nexpands;
   70         int         idr_maxwant;
   71         struct lwkt_token idr_token;
   72 };
   73 
   74 void    *idr_find(struct idr *idp, int id);
   75 void    *idr_replace(struct idr *idp, void *ptr, int id);
   76 void     idr_remove(struct idr *idp, int id);
   77 void     idr_remove_all(struct idr *idp);
   78 void     idr_destroy(struct idr *idp);
   79 int      idr_for_each(struct idr *idp, int (*fn)(int id, void *p, void *data), void *data);
   80 int      idr_get_new(struct idr *idp, void *ptr, int *id);
   81 int      idr_get_new_above(struct idr *idp, void *ptr, int sid, int *id);
   82 int      idr_pre_get(struct idr *idp, unsigned gfp_mask);
   83 
   84 void     idr_init(struct idr *idp);
   85 
   86 
   87 #endif /* _KERNEL */
   88 
   89 #endif /* _IDR_H_ */

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