2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013 Mellanox Technologies, Ltd.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 #include <sys/param.h>
36 #include <sys/mutex.h>
38 #include <linux/types.h>
41 #define IDR_SIZE (1 << IDR_BITS)
42 #define IDR_MASK (IDR_SIZE - 1)
44 #define MAX_ID_SHIFT ((sizeof(int) * NBBY) - 1)
45 #define MAX_ID_BIT (1U << MAX_ID_SHIFT)
46 #define MAX_ID_MASK (MAX_ID_BIT - 1)
47 #define MAX_LEVEL (MAX_ID_SHIFT + IDR_BITS - 1) / IDR_BITS
49 #define MAX_IDR_SHIFT (sizeof(int)*8 - 1)
50 #define MAX_IDR_BIT (1U << MAX_IDR_SHIFT)
51 #define MAX_IDR_MASK (MAX_IDR_BIT - 1)
55 struct idr_layer *ary[IDR_SIZE];
60 struct idr_layer *top;
61 struct idr_layer *free;
65 #define DEFINE_IDR(name) \
67 SYSINIT(name##_idr_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, \
70 void *idr_find(struct idr *idp, int id);
71 int idr_pre_get(struct idr *idp, gfp_t gfp_mask);
72 int idr_get_new(struct idr *idp, void *ptr, int *id);
73 int idr_get_new_above(struct idr *idp, void *ptr, int starting_id, int *id);
74 void *idr_replace(struct idr *idp, void *ptr, int id);
75 void idr_remove(struct idr *idp, int id);
76 void idr_remove_all(struct idr *idp);
77 void idr_destroy(struct idr *idp);
78 void idr_init(struct idr *idp);
80 #endif /* _LINUX_IDR_H_ */