1 /*- 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. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 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. 17 * 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. 28 */ 29 30 #ifndef _LINUX_IDR_H_ 31 #define _LINUX_IDR_H_ 32 33 #include <sys/kernel.h> 34 35 #define IDR_BITS 5 36 #define IDR_SIZE (1 << IDR_BITS) 37 #define IDR_MASK (IDR_SIZE - 1) 38 39 #define MAX_ID_SHIFT ((sizeof(int) * NBBY) - 1) 40 #define MAX_ID_BIT (1U << MAX_ID_SHIFT) 41 #define MAX_ID_MASK (MAX_ID_BIT - 1) 42 #define MAX_LEVEL (MAX_ID_SHIFT + IDR_BITS - 1) / IDR_BITS 43 44 #define MAX_IDR_SHIFT (sizeof(int)*8 - 1) 45 #define MAX_IDR_BIT (1U << MAX_IDR_SHIFT) 46 #define MAX_IDR_MASK (MAX_IDR_BIT - 1) 47 48 struct idr_layer { 49 unsigned long bitmap; 50 struct idr_layer *ary[IDR_SIZE]; 51 }; 52 53 struct idr { 54 struct mtx lock; 55 struct idr_layer *top; 56 struct idr_layer *free; 57 int layers; 58 }; 59 60 #define DEFINE_IDR(name) \ 61 struct idr name; \ 62 SYSINIT(name##_idr_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, \ 63 idr_init, &(name)); 64 65 void *idr_find(struct idr *idp, int id); 66 int idr_pre_get(struct idr *idp, gfp_t gfp_mask); 67 int idr_get_new(struct idr *idp, void *ptr, int *id); 68 int idr_get_new_above(struct idr *idp, void *ptr, int starting_id, 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 void idr_init(struct idr *idp); 74 75 #endif /* _LINUX_IDR_H_ */ 76