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: Maintains compatibility with linux, allowing NULL pointers. 43 */ 44 45 46 #ifndef _SYS_IDR_H_ 47 #define _SYS_IDR_H_ 48 49 #ifdef _KERNEL 50 51 #include <sys/thread.h> 52 53 struct idr_node { 54 void *data; 55 int allocated; 56 }; 57 58 struct idr { 59 struct idr_node *idr_nodes; 60 int idr_count; 61 int idr_lastindex; 62 int idr_freeindex; 63 int idr_nexpands; 64 int idr_maxwant; 65 struct lwkt_token idr_token; 66 }; 67 68 void *idr_find(struct idr *idp, int id); 69 void *idr_replace(struct idr *idp, void *ptr, int id); 70 void *idr_remove(struct idr *idp, int id); 71 void idr_remove_all(struct idr *idp); 72 void idr_destroy(struct idr *idp); 73 int idr_for_each(struct idr *idp, int (*fn)(int id, void *p, void *data), void *data); 74 int idr_get_new(struct idr *idp, void *ptr, int *id); 75 int idr_get_new_above(struct idr *idp, void *ptr, int sid, int *id); 76 int idr_pre_get(struct idr *idp, unsigned gfp_mask); 77 78 void idr_init(struct idr *idp); 79 80 int idr_alloc(struct idr *idp, void *ptr, int start, int end, unsigned gfp_mask); 81 82 static inline void idr_preload(unsigned gfp_mask) 83 { 84 /* Linux disables preemption and allocates a per-cpu buffer here */ 85 } 86 87 static inline void idr_preload_end(void) 88 { 89 /* Linux re-enables preemption here */ 90 } 91 92 #endif /* _KERNEL */ 93 94 #endif /* !_SYS_IDR_H_ */ 95