1219820Sjeff/*- 2219820Sjeff * Copyright (c) 2010 Isilon Systems, Inc. 3219820Sjeff * Copyright (c) 2010 iX Systems, Inc. 4219820Sjeff * Copyright (c) 2010 Panasas, Inc. 5271127Shselasky * Copyright (c) 2013 Mellanox Technologies, Ltd. 6219820Sjeff * All rights reserved. 7219820Sjeff * 8219820Sjeff * Redistribution and use in source and binary forms, with or without 9219820Sjeff * modification, are permitted provided that the following conditions 10219820Sjeff * are met: 11219820Sjeff * 1. Redistributions of source code must retain the above copyright 12219820Sjeff * notice unmodified, this list of conditions, and the following 13219820Sjeff * disclaimer. 14219820Sjeff * 2. Redistributions in binary form must reproduce the above copyright 15219820Sjeff * notice, this list of conditions and the following disclaimer in the 16219820Sjeff * documentation and/or other materials provided with the distribution. 17219820Sjeff * 18219820Sjeff * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19219820Sjeff * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20219820Sjeff * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21219820Sjeff * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22219820Sjeff * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23219820Sjeff * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24219820Sjeff * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25219820Sjeff * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26219820Sjeff * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27219820Sjeff * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28219820Sjeff */ 29219820Sjeff 30219820Sjeff#ifndef _LINUX_IDR_H_ 31219820Sjeff#define _LINUX_IDR_H_ 32219820Sjeff 33219820Sjeff#include <sys/kernel.h> 34219820Sjeff 35219820Sjeff#define IDR_BITS 5 36219820Sjeff#define IDR_SIZE (1 << IDR_BITS) 37219820Sjeff#define IDR_MASK (IDR_SIZE - 1) 38219820Sjeff 39219820Sjeff#define MAX_ID_SHIFT ((sizeof(int) * NBBY) - 1) 40219820Sjeff#define MAX_ID_BIT (1U << MAX_ID_SHIFT) 41219820Sjeff#define MAX_ID_MASK (MAX_ID_BIT - 1) 42219820Sjeff#define MAX_LEVEL (MAX_ID_SHIFT + IDR_BITS - 1) / IDR_BITS 43219820Sjeff 44255932Salfred#define MAX_IDR_SHIFT (sizeof(int)*8 - 1) 45255932Salfred#define MAX_IDR_BIT (1U << MAX_IDR_SHIFT) 46255932Salfred#define MAX_IDR_MASK (MAX_IDR_BIT - 1) 47255932Salfred 48219820Sjeffstruct idr_layer { 49219820Sjeff unsigned long bitmap; 50219820Sjeff struct idr_layer *ary[IDR_SIZE]; 51219820Sjeff}; 52219820Sjeff 53219820Sjeffstruct idr { 54219820Sjeff struct mtx lock; 55219820Sjeff struct idr_layer *top; 56219820Sjeff struct idr_layer *free; 57219820Sjeff int layers; 58219820Sjeff}; 59219820Sjeff 60219820Sjeff#define DEFINE_IDR(name) \ 61219820Sjeff struct idr name; \ 62219820Sjeff SYSINIT(name##_idr_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, \ 63219820Sjeff idr_init, &(name)); 64219820Sjeff 65219820Sjeffvoid *idr_find(struct idr *idp, int id); 66219820Sjeffint idr_pre_get(struct idr *idp, gfp_t gfp_mask); 67219820Sjeffint idr_get_new(struct idr *idp, void *ptr, int *id); 68219820Sjeffint idr_get_new_above(struct idr *idp, void *ptr, int starting_id, int *id); 69219820Sjeffvoid *idr_replace(struct idr *idp, void *ptr, int id); 70219820Sjeffvoid idr_remove(struct idr *idp, int id); 71219820Sjeffvoid idr_remove_all(struct idr *idp); 72219820Sjeffvoid idr_destroy(struct idr *idp); 73219820Sjeffvoid idr_init(struct idr *idp); 74219820Sjeff 75219820Sjeff#endif /* _LINUX_IDR_H_ */ 76