Release 4.14 include/linux/idr.h
/*
* include/linux/idr.h
*
* 2002-10-18 written by Jim Houston jim.houston@ccur.com
* Copyright (C) 2002 by Concurrent Computer Corporation
* Distributed under the GNU GPL license version 2.
*
* Small id to pointer translation service avoiding fixed sized
* tables.
*/
#ifndef __IDR_H__
#define __IDR_H__
#include <linux/radix-tree.h>
#include <linux/gfp.h>
#include <linux/percpu.h>
struct idr {
struct radix_tree_root idr_rt;
unsigned int idr_next;
};
/*
* The IDR API does not expose the tagging functionality of the radix tree
* to users. Use tag 0 to track whether a node has free space below it.
*/
#define IDR_FREE 0
/* Set the IDR flag and the IDR_FREE tag */
#define IDR_RT_MARKER ((__force gfp_t)(3 << __GFP_BITS_SHIFT))
#define IDR_INIT \
{ \
.idr_rt = RADIX_TREE_INIT(IDR_RT_MARKER) \
}
#define DEFINE_IDR(name) struct idr name = IDR_INIT
/**
* idr_get_cursor - Return the current position of the cyclic allocator
* @idr: idr handle
*
* The value returned is the value that will be next returned from
* idr_alloc_cyclic() if it is free (otherwise the search will start from
* this position).
*/
static inline unsigned int idr_get_cursor(const struct idr *idr)
{
return READ_ONCE(idr->idr_next);
}
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/**
* idr_set_cursor - Set the current position of the cyclic allocator
* @idr: idr handle
* @val: new position
*
* The next call to idr_alloc_cyclic() will return @val if it is free
* (otherwise the search will start from this position).
*/
static inline void idr_set_cursor(struct idr *idr, unsigned int val)
{
WRITE_ONCE(idr->idr_next, val);
}
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/**
* DOC: idr sync
* idr synchronization (stolen from radix-tree.h)
*
* idr_find() is able to be called locklessly, using RCU. The caller must
* ensure calls to this function are made within rcu_read_lock() regions.
* Other readers (lock-free or otherwise) and modifications may be running
* concurrently.
*
* It is still required that the caller manage the synchronization and
* lifetimes of the items. So if RCU lock-free lookups are used, typically
* this would mean that the items have their own locks, or are amenable to
* lock-free access; and that the items are freed by RCU (or only freed after
* having been deleted from the idr tree *and* a synchronize_rcu() grace
* period).
*/
void idr_preload(gfp_t gfp_mask);
int idr_alloc_cmn(struct idr *idr, void *ptr, unsigned long *index,
unsigned long start, unsigned long end, gfp_t gfp,
bool ext);
/**
* idr_alloc - allocate an id
* @idr: idr handle
* @ptr: pointer to be associated with the new id
* @start: the minimum id (inclusive)
* @end: the maximum id (exclusive)
* @gfp: memory allocation flags
*
* Allocates an unused ID in the range [start, end). Returns -ENOSPC
* if there are no unused IDs in that range.
*
* Note that @end is treated as max when <= 0. This is to always allow
* using @start + N as @end as long as N is inside integer range.
*
* Simultaneous modifications to the @idr are not allowed and should be
* prevented by the user, usually with a lock. idr_alloc() may be called
* concurrently with read-only accesses to the @idr, such as idr_find() and
* idr_for_each_entry().
*/
static inline int idr_alloc(struct idr *idr, void *ptr,
int start, int end, gfp_t gfp)
{
unsigned long id;
int ret;
if (WARN_ON_ONCE(start < 0))
return -EINVAL;
ret = idr_alloc_cmn(idr, ptr, &id, start, end, gfp, false);
if (ret)
return ret;
return id;
}
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static inline int idr_alloc_ext(struct idr *idr, void *ptr,
unsigned long *index,
unsigned long start,
unsigned long end,
gfp_t gfp)
{
return idr_alloc_cmn(idr, ptr, index, start, end, gfp, true);
}
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int idr_alloc_cyclic(struct idr *, void *entry, int start, int end, gfp_t);
int idr_for_each(const struct idr *,
int (*fn)(int id, void *p, void *data), void *data);
void *idr_get_next(struct idr *, int *nextid);
void *idr_get_next_ext(struct idr *idr, unsigned long *nextid);
void *idr_replace(struct idr *, void *, int id);
void *idr_replace_ext(struct idr *idr, void *ptr, unsigned long id);
void idr_destroy(struct idr *);
static inline void *idr_remove_ext(struct idr *idr, unsigned long id)
{
return radix_tree_delete_item(&idr->idr_rt, id, NULL);
}
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static inline void *idr_remove(struct idr *idr, int id)
{
return idr_remove_ext(idr, id);
}
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static inline void idr_init(struct idr *idr)
{
INIT_RADIX_TREE(&idr->idr_rt, IDR_RT_MARKER);
idr->idr_next = 0;
}
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static inline bool idr_is_empty(const struct idr *idr)
{
return radix_tree_empty(&idr->idr_rt) &&
radix_tree_tagged(&idr->idr_rt, IDR_FREE);
}
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/**
* idr_preload_end - end preload section started with idr_preload()
*
* Each idr_preload() should be matched with an invocation of this
* function. See idr_preload() for details.
*/
static inline void idr_preload_end(void)
{
preempt_enable();
}
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/**
* idr_find - return pointer for given id
* @idr: idr handle
* @id: lookup key
*
* Return the pointer given the id it has been registered with. A %NULL
* return indicates that @id is not valid or you passed %NULL in
* idr_get_new().
*
* This function can be called under rcu_read_lock(), given that the leaf
* pointers lifetimes are correctly managed.
*/
static inline void *idr_find_ext(const struct idr *idr, unsigned long id)
{
return radix_tree_lookup(&idr->idr_rt, id);
}
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static inline void *idr_find(const struct idr *idr, int id)
{
return idr_find_ext(idr, id);
}
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/**
* idr_for_each_entry - iterate over an idr's elements of a given type
* @idr: idr handle
* @entry: the type * to use as cursor
* @id: id entry's key
*
* @entry and @id do not need to be initialized before the loop, and
* after normal terminatinon @entry is left with the value NULL. This
* is convenient for a "not found" value.
*/
#define idr_for_each_entry(idr, entry, id) \
for (id = 0; ((entry) = idr_get_next(idr, &(id))) != NULL; ++id)
#define idr_for_each_entry_ext(idr, entry, id) \
for (id = 0; ((entry) = idr_get_next_ext(idr, &(id))) != NULL; ++id)
/**
* idr_for_each_entry_continue - continue iteration over an idr's elements of a given type
* @idr: idr handle
* @entry: the type * to use as cursor
* @id: id entry's key
*
* Continue to iterate over list of given type, continuing after
* the current position.
*/
#define idr_for_each_entry_continue(idr, entry, id) \
for ((entry) = idr_get_next((idr), &(id)); \
entry; \
++id, (entry) = idr_get_next((idr), &(id)))
/*
* IDA - IDR based id allocator, use when translation from id to
* pointer isn't necessary.
*/
#define IDA_CHUNK_SIZE 128
/* 128 bytes per chunk */
#define IDA_BITMAP_LONGS (IDA_CHUNK_SIZE / sizeof(long))
#define IDA_BITMAP_BITS (IDA_BITMAP_LONGS * sizeof(long) * 8)
struct ida_bitmap {
unsigned long bitmap[IDA_BITMAP_LONGS];
};
DECLARE_PER_CPU(struct ida_bitmap *, ida_bitmap);
struct ida {
struct radix_tree_root ida_rt;
};
#define IDA_INIT { \
.ida_rt = RADIX_TREE_INIT(IDR_RT_MARKER | GFP_NOWAIT), \
}
#define DEFINE_IDA(name) struct ida name = IDA_INIT
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);
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 void ida_init(struct ida *ida)
{
INIT_RADIX_TREE(&ida->ida_rt, IDR_RT_MARKER | GFP_NOWAIT);
}
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/**
* ida_get_new - allocate new ID
* @ida: idr handle
* @p_id: pointer to the allocated handle
*
* Simple wrapper around ida_get_new_above() w/ @starting_id of zero.
*/
static inline int ida_get_new(struct ida *ida, int *p_id)
{
return ida_get_new_above(ida, 0, p_id);
}
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static inline bool ida_is_empty(const struct ida *ida)
{
return radix_tree_empty(&ida->ida_rt);
}
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#endif /* __IDR_H__ */
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