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
idr_preload(unsigned gfp_mask)82 static inline void idr_preload(unsigned gfp_mask)
83 {
84 /* Linux disables preemption and allocates a per-cpu buffer here */
85 }
86
idr_preload_end(void)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