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/* $NetBSD: idr.h,v 1.10 2022/10/25 23:36:32 riastradh Exp $ */
/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Taylor R. Campbell.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _LINUX_IDR_H_
#define _LINUX_IDR_H_
#include <sys/types.h>
#include <sys/rbtree.h>
#include <linux/gfp.h>
/* XXX Stupid expedient algorithm should be replaced by something better. */
struct idr {
kmutex_t idr_lock;
rb_tree_t idr_tree;
int idr_base;
};
/* XXX Make the nm output a little more greppable... */
#define idr_alloc linux_idr_alloc
#define idr_destroy linux_idr_destroy
#define idr_find linux_idr_find
#define idr_for_each linux_idr_for_each
#define idr_get_next linux_idr_get_next
#define idr_init linux_idr_init
#define idr_init_base linux_idr_init_base
#define idr_is_empty linux_idr_is_empty
#define idr_preload linux_idr_preload
#define idr_preload_end linux_idr_preload_end
#define idr_remove linux_idr_remove
#define idr_replace linux_idr_replace
int linux_idr_module_init(void);
void linux_idr_module_fini(void);
void idr_init(struct idr *);
void idr_init_base(struct idr *, int);
void idr_destroy(struct idr *);
bool idr_is_empty(struct idr *);
void *idr_find(struct idr *, int);
void *idr_get_next(struct idr *, int *);
void *idr_replace(struct idr *, void *, int);
void *idr_remove(struct idr *, int);
void idr_preload(gfp_t);
int idr_alloc(struct idr *, void *, int, int, gfp_t);
void idr_preload_end(void);
int idr_for_each(struct idr *, int (*)(int, void *, void *), void *);
#define idr_for_each_entry(IDR, ENTRY, ID) \
for ((ID) = 0; ((ENTRY) = idr_get_next((IDR), &(ID))) != NULL; (ID)++)
struct ida {
struct idr ida_idr;
};
static inline void
ida_init(struct ida *ida)
{
idr_init(&ida->ida_idr);
}
static inline void
ida_destroy(struct ida *ida)
{
idr_destroy(&ida->ida_idr);
}
static inline void
ida_free(struct ida *ida, int id)
{
idr_remove(&ida->ida_idr, id);
}
static inline int
ida_simple_get(struct ida *ida, unsigned start, unsigned end, gfp_t gfp)
{
int id;
KASSERT(start <= INT_MAX);
KASSERT(end <= INT_MAX);
idr_preload(gfp);
id = idr_alloc(&ida->ida_idr, NULL, start, end, gfp);
idr_preload_end();
return id;
}
static inline int
ida_alloc_max(struct ida *ida, unsigned max, gfp_t gfp)
{
return ida_simple_get(ida, 0, max + 1, gfp);
}
static inline void
ida_simple_remove(struct ida *ida, unsigned int id)
{
KASSERT((int)id >= 0);
ida_free(ida, id);
}
#endif /* _LINUX_IDR_H_ */
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