2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 #include <sys/kernel.h>
35 #define IDR_SIZE (1 << IDR_BITS)
36 #define IDR_MASK (IDR_SIZE - 1)
38 #define MAX_ID_SHIFT ((sizeof(int) * NBBY) - 1)
39 #define MAX_ID_BIT (1U << MAX_ID_SHIFT)
40 #define MAX_ID_MASK (MAX_ID_BIT - 1)
41 #define MAX_LEVEL (MAX_ID_SHIFT + IDR_BITS - 1) / IDR_BITS
43 #define MAX_IDR_SHIFT (sizeof(int)*8 - 1)
44 #define MAX_IDR_BIT (1U << MAX_IDR_SHIFT)
45 #define MAX_IDR_MASK (MAX_IDR_BIT - 1)
49 struct idr_layer *ary[IDR_SIZE];
54 struct idr_layer *top;
55 struct idr_layer *free;
59 #define DEFINE_IDR(name) \
61 SYSINIT(name##_idr_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, \
64 void *idr_find(struct idr *idp, int id);
65 int idr_pre_get(struct idr *idp, gfp_t gfp_mask);
66 int idr_get_new(struct idr *idp, void *ptr, int *id);
67 int idr_get_new_above(struct idr *idp, void *ptr, int starting_id, int *id);
68 void *idr_replace(struct idr *idp, void *ptr, int id);
69 void idr_remove(struct idr *idp, int id);
70 void idr_remove_all(struct idr *idp);
71 void idr_destroy(struct idr *idp);
72 void idr_init(struct idr *idp);
74 #endif /* _LINUX_IDR_H_ */