[net-next-2.6.git] / include / linux / slab.h

/*
 * linux/mm/slab.h
 * Written by Mark Hemment, 1996.
 * (markhe@nextd.demon.co.uk)
 */

#ifndef _LINUX_SLAB_H
#define	_LINUX_SLAB_H

#if	defined(__KERNEL__)

typedef struct kmem_cache_s kmem_cache_t;

#include	<linux/config.h>	/* kmalloc_sizes.h needs CONFIG_ options */
#include	<linux/gfp.h>
#include	<linux/init.h>
#include	<linux/types.h>
#include	<asm/page.h>		/* kmalloc_sizes.h needs PAGE_SIZE */
#include	<asm/cache.h>		/* kmalloc_sizes.h needs L1_CACHE_BYTES */

/* flags for kmem_cache_alloc() */
#define	SLAB_NOFS		GFP_NOFS
#define	SLAB_NOIO		GFP_NOIO
#define	SLAB_ATOMIC		GFP_ATOMIC
#define	SLAB_USER		GFP_USER
#define	SLAB_KERNEL		GFP_KERNEL
#define	SLAB_DMA		GFP_DMA

#define SLAB_LEVEL_MASK		GFP_LEVEL_MASK

#define	SLAB_NO_GROW		__GFP_NO_GROW	/* don't grow a cache */

/* flags to pass to kmem_cache_create().
 * The first 3 are only valid when the allocator as been build
 * SLAB_DEBUG_SUPPORT.
 */
#define	SLAB_DEBUG_FREE		0x00000100UL	/* Peform (expensive) checks on free */
#define	SLAB_DEBUG_INITIAL	0x00000200UL	/* Call constructor (as verifier) */
#define	SLAB_RED_ZONE		0x00000400UL	/* Red zone objs in a cache */
#define	SLAB_POISON		0x00000800UL	/* Poison objects */
#define	SLAB_NO_REAP		0x00001000UL	/* never reap from the cache */
#define	SLAB_HWCACHE_ALIGN	0x00002000UL	/* align objs on a h/w cache lines */
#define SLAB_CACHE_DMA		0x00004000UL	/* use GFP_DMA memory */
#define SLAB_MUST_HWCACHE_ALIGN	0x00008000UL	/* force alignment */
#define SLAB_STORE_USER		0x00010000UL	/* store the last owner for bug hunting */
#define SLAB_RECLAIM_ACCOUNT	0x00020000UL	/* track pages allocated to indicate
						   what is reclaimable later*/
#define SLAB_PANIC		0x00040000UL	/* panic if kmem_cache_create() fails */
#define SLAB_DESTROY_BY_RCU	0x00080000UL	/* defer freeing pages to RCU */

/* flags passed to a constructor func */
#define	SLAB_CTOR_CONSTRUCTOR	0x001UL		/* if not set, then deconstructor */
#define SLAB_CTOR_ATOMIC	0x002UL		/* tell constructor it can't sleep */
#define	SLAB_CTOR_VERIFY	0x004UL		/* tell constructor it's a verify call */

/* prototypes */
extern void __init kmem_cache_init(void);

extern kmem_cache_t *kmem_cache_create(const char *, size_t, size_t, unsigned long,
				       void (*)(void *, kmem_cache_t *, unsigned long),
				       void (*)(void *, kmem_cache_t *, unsigned long));
extern int kmem_cache_destroy(kmem_cache_t *);
extern int kmem_cache_shrink(kmem_cache_t *);
extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t);
extern void kmem_cache_free(kmem_cache_t *, void *);
extern unsigned int kmem_cache_size(kmem_cache_t *);
extern const char *kmem_cache_name(kmem_cache_t *);
extern kmem_cache_t *kmem_find_general_cachep(size_t size, gfp_t gfpflags);

/* Size description struct for general caches. */
struct cache_sizes {
	size_t		 cs_size;
	kmem_cache_t	*cs_cachep;
	kmem_cache_t	*cs_dmacachep;
};
extern struct cache_sizes malloc_sizes[];
extern void *__kmalloc(size_t, gfp_t);

static inline void *kmalloc(size_t size, gfp_t flags)
{
	if (__builtin_constant_p(size)) {
		int i = 0;
#define CACHE(x) \
		if (size <= x) \
			goto found; \
		else \
			i++;
#include "kmalloc_sizes.h"
#undef CACHE
		{
			extern void __you_cannot_kmalloc_that_much(void);
			__you_cannot_kmalloc_that_much();
		}
found:
		return kmem_cache_alloc((flags & GFP_DMA) ?
			malloc_sizes[i].cs_dmacachep :
			malloc_sizes[i].cs_cachep, flags);
	}
	return __kmalloc(size, flags);
}

extern void *kzalloc(size_t, gfp_t);

/**
 * kcalloc - allocate memory for an array. The memory is set to zero.
 * @n: number of elements.
 * @size: element size.
 * @flags: the type of memory to allocate.
 */
static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
{
	if (n != 0 && size > INT_MAX / n)
		return NULL;
	return kzalloc(n * size, flags);
}

extern void kfree(const void *);
extern unsigned int ksize(const void *);

#ifdef CONFIG_NUMA
extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node);
extern void *kmalloc_node(size_t size, gfp_t flags, int node);
#else
static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, int flags, int node)
{
	return kmem_cache_alloc(cachep, flags);
}
static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
{
	return kmalloc(size, flags);
}
#endif

extern int FASTCALL(kmem_cache_reap(int));
extern int FASTCALL(kmem_ptr_validate(kmem_cache_t *cachep, void *ptr));

/* System wide caches */
extern kmem_cache_t	*vm_area_cachep;
extern kmem_cache_t	*names_cachep;
extern kmem_cache_t	*files_cachep;
extern kmem_cache_t	*filp_cachep;
extern kmem_cache_t	*fs_cachep;
extern kmem_cache_t	*signal_cachep;
extern kmem_cache_t	*sighand_cachep;
extern kmem_cache_t	*bio_cachep;

extern atomic_t slab_reclaim_pages;

#endif	/* __KERNEL__ */

#endif	/* _LINUX_SLAB_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/mm/slab.h
	3	* Written by Mark Hemment, 1996.
	4	* (markhe@nextd.demon.co.uk)
	5	*/
	6
	7	#ifndef _LINUX_SLAB_H
	8	#define _LINUX_SLAB_H
	9
	10	#if defined(__KERNEL__)
	11
	12	typedef struct kmem_cache_s kmem_cache_t;
	13
	14	#include <linux/config.h> /* kmalloc_sizes.h needs CONFIG_ options */
	15	#include <linux/gfp.h>
	16	#include <linux/init.h>
	17	#include <linux/types.h>
	18	#include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
	19	#include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
	20
	21	/* flags for kmem_cache_alloc() */
	22	#define SLAB_NOFS GFP_NOFS
	23	#define SLAB_NOIO GFP_NOIO
	24	#define SLAB_ATOMIC GFP_ATOMIC
	25	#define SLAB_USER GFP_USER
	26	#define SLAB_KERNEL GFP_KERNEL
	27	#define SLAB_DMA GFP_DMA
	28
	29	#define SLAB_LEVEL_MASK GFP_LEVEL_MASK
	30
	31	#define SLAB_NO_GROW __GFP_NO_GROW /* don't grow a cache */
	32
	33	/* flags to pass to kmem_cache_create().
	34	* The first 3 are only valid when the allocator as been build
	35	* SLAB_DEBUG_SUPPORT.
	36	*/
	37	#define SLAB_DEBUG_FREE 0x00000100UL /* Peform (expensive) checks on free */
	38	#define SLAB_DEBUG_INITIAL 0x00000200UL /* Call constructor (as verifier) */
	39	#define SLAB_RED_ZONE 0x00000400UL /* Red zone objs in a cache */
	40	#define SLAB_POISON 0x00000800UL /* Poison objects */
	41	#define SLAB_NO_REAP 0x00001000UL /* never reap from the cache */
	42	#define SLAB_HWCACHE_ALIGN 0x00002000UL /* align objs on a h/w cache lines */
	43	#define SLAB_CACHE_DMA 0x00004000UL /* use GFP_DMA memory */
	44	#define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* force alignment */
	45	#define SLAB_STORE_USER 0x00010000UL /* store the last owner for bug hunting */
	46	#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* track pages allocated to indicate
	47	what is reclaimable later*/
	48	#define SLAB_PANIC 0x00040000UL /* panic if kmem_cache_create() fails */
	49	#define SLAB_DESTROY_BY_RCU 0x00080000UL /* defer freeing pages to RCU */
	50
	51	/* flags passed to a constructor func */
	52	#define SLAB_CTOR_CONSTRUCTOR 0x001UL /* if not set, then deconstructor */
	53	#define SLAB_CTOR_ATOMIC 0x002UL /* tell constructor it can't sleep */
	54	#define SLAB_CTOR_VERIFY 0x004UL /* tell constructor it's a verify call */
	55
	56	/* prototypes */
	57	extern void __init kmem_cache_init(void);
	58
	59	extern kmem_cache_t kmem_cache_create(const char , size_t, size_t, unsigned long,
	60	void ()(void , kmem_cache_t *, unsigned long),
	61	void ()(void , kmem_cache_t *, unsigned long));
	62	extern int kmem_cache_destroy(kmem_cache_t *);
	63	extern int kmem_cache_shrink(kmem_cache_t *);
dd0fc66f	64	extern void kmem_cache_alloc(kmem_cache_t , gfp_t);
1da177e4 LT	65	extern void kmem_cache_free(kmem_cache_t , void );
1da177e4 LT	66	extern unsigned int kmem_cache_size(kmem_cache_t *);
1944972d	67	extern const char kmem_cache_name(kmem_cache_t );
dd0fc66f	68	extern kmem_cache_t *kmem_find_general_cachep(size_t size, gfp_t gfpflags);
1da177e4 LT	69
	70	/* Size description struct for general caches. */
	71	struct cache_sizes {
	72	size_t cs_size;
	73	kmem_cache_t *cs_cachep;
	74	kmem_cache_t *cs_dmacachep;
	75	};
	76	extern struct cache_sizes malloc_sizes[];
dd0fc66f	77	extern void *__kmalloc(size_t, gfp_t);
1da177e4	78
dd0fc66f	79	static inline void *kmalloc(size_t size, gfp_t flags)
1da177e4 LT	80	{
	81	if (__builtin_constant_p(size)) {
	82	int i = 0;
	83	#define CACHE(x) \
	84	if (size <= x) \
	85	goto found; \
	86	else \
	87	i++;
	88	#include "kmalloc_sizes.h"
	89	#undef CACHE
	90	{
	91	extern void __you_cannot_kmalloc_that_much(void);
	92	__you_cannot_kmalloc_that_much();
	93	}
	94	found:
	95	return kmem_cache_alloc((flags & GFP_DMA) ?
	96	malloc_sizes[i].cs_dmacachep :
	97	malloc_sizes[i].cs_cachep, flags);
	98	}
	99	return __kmalloc(size, flags);
	100	}
	101
dd0fc66f	102	extern void *kzalloc(size_t, gfp_t);
dd392710 PE	103
	104	/**
	105	* kcalloc - allocate memory for an array. The memory is set to zero.
	106	* @n: number of elements.
	107	* @size: element size.
	108	* @flags: the type of memory to allocate.
	109	*/
dd0fc66f	110	static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
dd392710 PE	111	{
	112	if (n != 0 && size > INT_MAX / n)
	113	return NULL;
	114	return kzalloc(n * size, flags);
	115	}
	116
1da177e4 LT	117	extern void kfree(const void *);
	118	extern unsigned int ksize(const void *);
	119
97e2bde4	120	#ifdef CONFIG_NUMA
dd0fc66f AV	121	extern void kmem_cache_alloc_node(kmem_cache_t , gfp_t flags, int node);
dd0fc66f AV	122	extern void *kmalloc_node(size_t size, gfp_t flags, int node);
97e2bde4 MS	123	#else
	124	static inline void kmem_cache_alloc_node(kmem_cache_t cachep, int flags, int node)
	125	{
	126	return kmem_cache_alloc(cachep, flags);
	127	}
dd0fc66f	128	static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
97e2bde4 MS	129	{
	130	return kmalloc(size, flags);
	131	}
	132	#endif
	133
1da177e4 LT	134	extern int FASTCALL(kmem_cache_reap(int));
	135	extern int FASTCALL(kmem_ptr_validate(kmem_cache_t cachep, void ptr));
	136
	137	/* System wide caches */
	138	extern kmem_cache_t *vm_area_cachep;
	139	extern kmem_cache_t *names_cachep;
	140	extern kmem_cache_t *files_cachep;
	141	extern kmem_cache_t *filp_cachep;
	142	extern kmem_cache_t *fs_cachep;
	143	extern kmem_cache_t *signal_cachep;
	144	extern kmem_cache_t *sighand_cachep;
	145	extern kmem_cache_t *bio_cachep;
	146
	147	extern atomic_t slab_reclaim_pages;
	148
	149	#endif /* __KERNEL__ */
	150
	151	#endif /* _LINUX_SLAB_H */