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#ifndef __IDR_H__
#define __IDR_H__
#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/rcupdate.h>
#define IDR_BITS 8
#define IDR_SIZE (1 << IDR_BITS)
#define IDR_MASK ((1 << IDR_BITS)-1)
struct idr_layer {
int prefix;
DECLARE_BITMAP(bitmap, IDR_SIZE);
struct idr_layer __rcu *ary[1<<IDR_BITS];
int count;
int layer;
struct rcu_head rcu_head;
};
struct idr {
struct idr_layer __rcu *hint;
struct idr_layer __rcu *top;
struct idr_layer *id_free;
int layers;
int id_free_cnt;
int cur;
spinlock_t lock;
};
#define IDR_INIT(name) \
{ \
.lock = __SPIN_LOCK_UNLOCKED(name.lock), \
}
#define DEFINE_IDR(name) struct idr name = IDR_INIT(name)
void *idr_find_slowpath(struct idr *idp, int id);
void idr_preload(gfp_t gfp_mask);
int idr_alloc(struct idr *idp, void *ptr, int start, int end, gfp_t gfp_mask);
int idr_alloc_cyclic(struct idr *idr, void *ptr, int start, int end, gfp_t gfp_mask);
int idr_for_each(struct idr *idp,
int (*fn)(int id, void *p, void *data), void *data);
void *idr_get_next(struct idr *idp, int *nextid);
void *idr_replace(struct idr *idp, void *ptr, int id);
void idr_remove(struct idr *idp, int id);
void idr_free(struct idr *idp, int id);
void idr_destroy(struct idr *idp);
void idr_init(struct idr *idp);
static inline void idr_preload_end(void)
{
preempt_enable();
}
static inline void *idr_find(struct idr *idr, int id)
{
struct idr_layer *hint = rcu_dereference_raw(idr->hint);
if (hint && (id & ~IDR_MASK) == hint->prefix)
return rcu_dereference_raw(hint->ary[id & IDR_MASK]);
return idr_find_slowpath(idr, id);
}
#define idr_for_each_entry(idp, entry, id) \
for (id = 0; ((entry) = idr_get_next(idp, &(id))) != NULL; ++id)
int __idr_pre_get(struct idr *idp, gfp_t gfp_mask);
int __idr_get_new_above(struct idr *idp, void *ptr, int starting_id, int *id);
void __idr_remove_all(struct idr *idp);
static inline int __deprecated idr_pre_get(struct idr *idp, gfp_t gfp_mask)
{
return __idr_pre_get(idp, gfp_mask);
}
static inline int __deprecated idr_get_new_above(struct idr *idp, void *ptr,
int starting_id, int *id)
{
return __idr_get_new_above(idp, ptr, starting_id, id);
}
static inline int __deprecated idr_get_new(struct idr *idp, void *ptr, int *id)
{
return __idr_get_new_above(idp, ptr, 0, id);
}
static inline void __deprecated idr_remove_all(struct idr *idp)
{
__idr_remove_all(idp);
}
#define IDA_CHUNK_SIZE 128 /* 128 bytes per chunk */
#define IDA_BITMAP_LONGS (IDA_CHUNK_SIZE / sizeof(long) - 1)
#define IDA_BITMAP_BITS (IDA_BITMAP_LONGS * sizeof(long) * 8)
struct ida_bitmap {
long nr_busy;
unsigned long bitmap[IDA_BITMAP_LONGS];
};
struct ida {
struct idr idr;
struct ida_bitmap *free_bitmap;
};
#define IDA_INIT(name) { .idr = IDR_INIT((name).idr), .free_bitmap = NULL, }
#define DEFINE_IDA(name) struct ida name = IDA_INIT(name)
int ida_pre_get(struct ida *ida, gfp_t gfp_mask);
int ida_get_new_above(struct ida *ida, int starting_id, int *p_id);
void ida_remove(struct ida *ida, int id);
void ida_destroy(struct ida *ida);
void ida_init(struct ida *ida);
int ida_simple_get(struct ida *ida, unsigned int start, unsigned int end,
gfp_t gfp_mask);
void ida_simple_remove(struct ida *ida, unsigned int id);
static inline int ida_get_new(struct ida *ida, int *p_id)
{
return ida_get_new_above(ida, 0, p_id);
}
void __init idr_init_cache(void);
#endif /* __IDR_H__ */
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