| 1 | /* $NetBSD: idr.h,v 1.3 2014/07/16 20:56:25 riastradh Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2013 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Taylor R. Campbell. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 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 the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | #ifndef _LINUX_IDR_H_ |
| 33 | #define _LINUX_IDR_H_ |
| 34 | |
| 35 | #include <sys/types.h> |
| 36 | #include <sys/rwlock.h> |
| 37 | #include <sys/rbtree.h> |
| 38 | #include <sys/queue.h> |
| 39 | |
| 40 | #include <linux/gfp.h> |
| 41 | |
| 42 | /* XXX Stupid expedient algorithm should be replaced by something better. */ |
| 43 | |
| 44 | struct idr { |
| 45 | kmutex_t idr_lock; |
| 46 | rb_tree_t idr_tree; |
| 47 | }; |
| 48 | |
| 49 | /* XXX Make the nm output a little more greppable... */ |
| 50 | #define idr_init linux_idr_init |
| 51 | #define idr_destroy linux_idr_destroy |
| 52 | #define idr_is_empty linux_idr_is_empty |
| 53 | #define idr_find linux_idr_find |
| 54 | #define idr_replace linux_idr_replace |
| 55 | #define idr_remove linux_idr_remove |
| 56 | #define idr_preload linux_idr_preload |
| 57 | #define idr_alloc linux_idr_alloc |
| 58 | #define idr_preload_end linux_idr_preload_end |
| 59 | #define idr_for_each linux_idr_for_each |
| 60 | |
| 61 | int linux_idr_module_init(void); |
| 62 | void linux_idr_module_fini(void); |
| 63 | |
| 64 | void idr_init(struct idr *); |
| 65 | void idr_destroy(struct idr *); |
| 66 | bool idr_is_empty(struct idr *); |
| 67 | void *idr_find(struct idr *, int); |
| 68 | void *idr_replace(struct idr *, void *, int); |
| 69 | void idr_remove(struct idr *, int); |
| 70 | void idr_preload(gfp_t); |
| 71 | int idr_alloc(struct idr *, void *, int, int, gfp_t); |
| 72 | void idr_preload_end(void); |
| 73 | int idr_for_each(struct idr *, int (*)(int, void *, void *), void *); |
| 74 | |
| 75 | struct ida { |
| 76 | struct idr ida_idr; |
| 77 | }; |
| 78 | |
| 79 | static inline void |
| 80 | ida_init(struct ida *ida) |
| 81 | { |
| 82 | |
| 83 | idr_init(&ida->ida_idr); |
| 84 | } |
| 85 | |
| 86 | static inline void |
| 87 | ida_destroy(struct ida *ida) |
| 88 | { |
| 89 | |
| 90 | idr_destroy(&ida->ida_idr); |
| 91 | } |
| 92 | |
| 93 | static inline void |
| 94 | ida_remove(struct ida *ida, int id) |
| 95 | { |
| 96 | |
| 97 | idr_remove(&ida->ida_idr, id); |
| 98 | } |
| 99 | |
| 100 | static inline int |
| 101 | ida_simple_get(struct ida *ida, unsigned start, unsigned end, gfp_t gfp) |
| 102 | { |
| 103 | int id; |
| 104 | |
| 105 | KASSERT(start <= INT_MAX); |
| 106 | KASSERT(end <= INT_MAX); |
| 107 | |
| 108 | idr_preload(gfp); |
| 109 | id = idr_alloc(&ida->ida_idr, NULL, start, end, gfp); |
| 110 | idr_preload_end(); |
| 111 | |
| 112 | return id; |
| 113 | } |
| 114 | |
| 115 | #endif /* _LINUX_IDR_H_ */ |
| 116 | |