1/*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 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. 16 * 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. 27 */ 28 29#ifndef _LINUX_IDR_H_ 30#define _LINUX_IDR_H_ 31 32#include <sys/kernel.h> 33 34#define IDR_BITS 5 35#define IDR_SIZE (1 << IDR_BITS) 36#define IDR_MASK (IDR_SIZE - 1) 37 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 42 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) 46 47struct idr_layer { 48 unsigned long bitmap; 49 struct idr_layer *ary[IDR_SIZE]; 50}; 51 52struct idr { 53 struct mtx lock; 54 struct idr_layer *top; 55 struct idr_layer *free; 56 int layers; 57}; 58 59#define DEFINE_IDR(name) \ 60 struct idr name; \ 61 SYSINIT(name##_idr_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, \ 62 idr_init, &(name)); 63 64void *idr_find(struct idr *idp, int id); 65int idr_pre_get(struct idr *idp, gfp_t gfp_mask); 66int idr_get_new(struct idr *idp, void *ptr, int *id); 67int idr_get_new_above(struct idr *idp, void *ptr, int starting_id, int *id); 68void *idr_replace(struct idr *idp, void *ptr, int id); 69void idr_remove(struct idr *idp, int id); 70void idr_remove_all(struct idr *idp); 71void idr_destroy(struct idr *idp); 72void idr_init(struct idr *idp); 73 74#endif /* _LINUX_IDR_H_ */ 75