128 lines
4.3 KiB
C
128 lines
4.3 KiB
C
/*-
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* Copyright (c) 2010 Isilon Systems, Inc.
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* Copyright (c) 2010 iX Systems, Inc.
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* Copyright (c) 2010 Panasas, Inc.
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* Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _LINUX_IDR_H_
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#define _LINUX_IDR_H_
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <linux/types.h>
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#define IDR_BITS 5
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#define IDR_SIZE (1 << IDR_BITS)
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#define IDR_MASK (IDR_SIZE - 1)
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#define MAX_ID_SHIFT ((sizeof(int) * NBBY) - 1)
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#define MAX_ID_BIT (1U << MAX_ID_SHIFT)
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#define MAX_ID_MASK (MAX_ID_BIT - 1)
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#define MAX_LEVEL (MAX_ID_SHIFT + IDR_BITS - 1) / IDR_BITS
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#define MAX_IDR_SHIFT (sizeof(int)*8 - 1)
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#define MAX_IDR_BIT (1U << MAX_IDR_SHIFT)
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#define MAX_IDR_MASK (MAX_IDR_BIT - 1)
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struct idr_layer {
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unsigned long bitmap;
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struct idr_layer *ary[IDR_SIZE];
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};
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struct idr {
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struct mtx lock;
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struct idr_layer *top;
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struct idr_layer *free;
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int layers;
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int next_cyclic_id;
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};
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/* NOTE: It is the applications responsibility to destroy the IDR */
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#define DEFINE_IDR(name) \
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struct idr name; \
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SYSINIT(name##_idr_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, \
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idr_init, &(name))
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/* NOTE: It is the applications responsibility to destroy the IDA */
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#define DEFINE_IDA(name) \
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struct ida name; \
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SYSINIT(name##_ida_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, \
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ida_init, &(name))
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void idr_preload(gfp_t gfp_mask);
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void idr_preload_end(void);
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void *idr_find(struct idr *idp, int id);
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void *idr_get_next(struct idr *idp, int *nextid);
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int idr_pre_get(struct idr *idp, gfp_t gfp_mask);
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int idr_get_new(struct idr *idp, void *ptr, int *id);
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int idr_get_new_above(struct idr *idp, void *ptr, int starting_id, int *id);
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void *idr_replace(struct idr *idp, void *ptr, int id);
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void idr_remove(struct idr *idp, int id);
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void idr_remove_all(struct idr *idp);
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void idr_destroy(struct idr *idp);
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void idr_init(struct idr *idp);
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int idr_alloc(struct idr *idp, void *ptr, int start, int end, gfp_t);
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int idr_alloc_cyclic(struct idr *idp, void *ptr, int start, int end, gfp_t);
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int idr_for_each(struct idr *idp, int (*fn)(int id, void *p, void *data), void *data);
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#define idr_for_each_entry(idp, entry, id) \
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for ((id) = 0; ((entry) = idr_get_next(idp, &(id))) != NULL; ++(id))
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#define IDA_CHUNK_SIZE 128 /* 128 bytes per chunk */
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#define IDA_BITMAP_LONGS (IDA_CHUNK_SIZE / sizeof(long) - 1)
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#define IDA_BITMAP_BITS (IDA_BITMAP_LONGS * sizeof(long) * 8)
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struct ida_bitmap {
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long nr_busy;
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unsigned long bitmap[IDA_BITMAP_LONGS];
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};
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struct ida {
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struct idr idr;
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struct ida_bitmap *free_bitmap;
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};
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int ida_pre_get(struct ida *ida, gfp_t gfp_mask);
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int ida_get_new_above(struct ida *ida, int starting_id, int *p_id);
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void ida_remove(struct ida *ida, int id);
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void ida_destroy(struct ida *ida);
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void ida_init(struct ida *ida);
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int ida_simple_get(struct ida *ida, unsigned int start, unsigned int end,
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gfp_t gfp_mask);
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void ida_simple_remove(struct ida *ida, unsigned int id);
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static inline int
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ida_get_new(struct ida *ida, int *p_id)
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{
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return (ida_get_new_above(ida, 0, p_id));
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}
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#endif /* _LINUX_IDR_H_ */
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