[linux-2.6-block.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 kmem_cache_t;

#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_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 */
#define SLAB_MEM_SPREAD		0x00100000UL	/* Spread some memory over cpuset */

/* 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 */

#ifndef CONFIG_SLOB

/* 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_zalloc(struct kmem_cache *, 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 *);

/* 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);
#ifndef CONFIG_DEBUG_SLAB
#define ____kmalloc(size, flags) __kmalloc(size, flags)
#else
extern void *__kmalloc_track_caller(size_t, gfp_t, void*);
#define ____kmalloc(size, flags) \
    __kmalloc_track_caller(size, flags, __builtin_return_address(0))
#endif

/**
 * kmalloc - allocate memory
 * @size: how many bytes of memory are required.
 * @flags: the type of memory to allocate.
 *
 * kmalloc is the normal method of allocating memory
 * in the kernel.
 *
 * The @flags argument may be one of:
 *
 * %GFP_USER - Allocate memory on behalf of user.  May sleep.
 *
 * %GFP_KERNEL - Allocate normal kernel ram.  May sleep.
 *
 * %GFP_ATOMIC - Allocation will not sleep.
 *   For example, use this inside interrupt handlers.
 *
 * %GFP_HIGHUSER - Allocate pages from high memory.
 *
 * %GFP_NOIO - Do not do any I/O at all while trying to get memory.
 *
 * %GFP_NOFS - Do not make any fs calls while trying to get memory.
 *
 * Also it is possible to set different flags by OR'ing
 * in one or more of the following additional @flags:
 *
 * %__GFP_COLD - Request cache-cold pages instead of
 *   trying to return cache-warm pages.
 *
 * %__GFP_DMA - Request memory from the DMA-capable zone.
 *
 * %__GFP_HIGH - This allocation has high priority and may use emergency pools.
 *
 * %__GFP_HIGHMEM - Allocated memory may be from highmem.
 *
 * %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
 *   (think twice before using).
 *
 * %__GFP_NORETRY - If memory is not immediately available,
 *   then give up at once.
 *
 * %__GFP_NOWARN - If allocation fails, don't issue any warnings.
 *
 * %__GFP_REPEAT - If allocation fails initially, try once more before failing.
 */
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);

/**
 * kzalloc - allocate memory. The memory is set to zero.
 * @size: how many bytes of memory are required.
 * @flags: the type of memory to allocate (see kmalloc).
 */
static inline void *kzalloc(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_kzalloc_that_much(void);
			__you_cannot_kzalloc_that_much();
		}
found:
		return kmem_cache_zalloc((flags & GFP_DMA) ?
			malloc_sizes[i].cs_dmacachep :
			malloc_sizes[i].cs_cachep, flags);
	}
	return __kzalloc(size, flags);
}

/**
 * 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 > ULONG_MAX / n)
		return NULL;
	return kzalloc(n * size, flags);
}

extern void kfree(const void *);
extern unsigned int ksize(const void *);
extern int slab_is_available(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, gfp_t 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));

#else /* CONFIG_SLOB */

/* SLOB allocator routines */

void kmem_cache_init(void);
struct kmem_cache *kmem_cache_create(const char *c, size_t, size_t,
	unsigned long,
	void (*)(void *, struct kmem_cache *, unsigned long),
	void (*)(void *, struct kmem_cache *, unsigned long));
int kmem_cache_destroy(struct kmem_cache *c);
void *kmem_cache_alloc(struct kmem_cache *c, gfp_t flags);
void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
void kmem_cache_free(struct kmem_cache *c, void *b);
const char *kmem_cache_name(struct kmem_cache *);
void *kmalloc(size_t size, gfp_t flags);
void *__kzalloc(size_t size, gfp_t flags);
void kfree(const void *m);
unsigned int ksize(const void *m);
unsigned int kmem_cache_size(struct kmem_cache *c);

static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
{
	return __kzalloc(n * size, flags);
}

#define kmem_cache_shrink(d) (0)
#define kmem_cache_reap(a)
#define kmem_ptr_validate(a, b) (0)
#define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f)
#define kmalloc_node(s, f, n) kmalloc(s, f)
#define kzalloc(s, f) __kzalloc(s, f)
#define ____kmalloc kmalloc

#endif /* CONFIG_SLOB */

/* 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	*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
2109a2d1	12	typedef struct kmem_cache kmem_cache_t;
1da177e4	13
1da177e4 LT	14	#include <linux/gfp.h>
	15	#include <linux/init.h>
	16	#include <linux/types.h>
	17	#include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
	18	#include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
	19
	20	/* flags for kmem_cache_alloc() */
	21	#define SLAB_NOFS GFP_NOFS
	22	#define SLAB_NOIO GFP_NOIO
	23	#define SLAB_ATOMIC GFP_ATOMIC
	24	#define SLAB_USER GFP_USER
	25	#define SLAB_KERNEL GFP_KERNEL
	26	#define SLAB_DMA GFP_DMA
	27
	28	#define SLAB_LEVEL_MASK GFP_LEVEL_MASK
	29
	30	#define SLAB_NO_GROW __GFP_NO_GROW /* don't grow a cache */
	31
	32	/* flags to pass to kmem_cache_create().
	33	* The first 3 are only valid when the allocator as been build
	34	* SLAB_DEBUG_SUPPORT.
	35	*/
	36	#define SLAB_DEBUG_FREE 0x00000100UL /* Peform (expensive) checks on free */
	37	#define SLAB_DEBUG_INITIAL 0x00000200UL /* Call constructor (as verifier) */
	38	#define SLAB_RED_ZONE 0x00000400UL /* Red zone objs in a cache */
	39	#define SLAB_POISON 0x00000800UL /* Poison objects */
1da177e4 LT	40	#define SLAB_HWCACHE_ALIGN 0x00002000UL /* align objs on a h/w cache lines */
	41	#define SLAB_CACHE_DMA 0x00004000UL /* use GFP_DMA memory */
	42	#define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL /* force alignment */
	43	#define SLAB_STORE_USER 0x00010000UL /* store the last owner for bug hunting */
	44	#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* track pages allocated to indicate
	45	what is reclaimable later*/
	46	#define SLAB_PANIC 0x00040000UL /* panic if kmem_cache_create() fails */
	47	#define SLAB_DESTROY_BY_RCU 0x00080000UL /* defer freeing pages to RCU */
101a5001	48	#define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */
1da177e4 LT	49
	50	/* flags passed to a constructor func */
	51	#define SLAB_CTOR_CONSTRUCTOR 0x001UL /* if not set, then deconstructor */
	52	#define SLAB_CTOR_ATOMIC 0x002UL /* tell constructor it can't sleep */
	53	#define SLAB_CTOR_VERIFY 0x004UL /* tell constructor it's a verify call */
	54
10cef602 MM	55	#ifndef CONFIG_SLOB
10cef602 MM	56
1da177e4 LT	57	/* prototypes */
	58	extern void __init kmem_cache_init(void);
	59
	60	extern kmem_cache_t kmem_cache_create(const char , size_t, size_t, unsigned long,
	61	void ()(void , kmem_cache_t *, unsigned long),
	62	void ()(void , kmem_cache_t *, unsigned long));
	63	extern int kmem_cache_destroy(kmem_cache_t *);
	64	extern int kmem_cache_shrink(kmem_cache_t *);
dd0fc66f	65	extern void kmem_cache_alloc(kmem_cache_t , gfp_t);
a8c0f9a4	66	extern void kmem_cache_zalloc(struct kmem_cache , gfp_t);
1da177e4 LT	67	extern void kmem_cache_free(kmem_cache_t , void );
1da177e4 LT	68	extern unsigned int kmem_cache_size(kmem_cache_t *);
1944972d	69	extern const char kmem_cache_name(kmem_cache_t );
1da177e4 LT	70
	71	/* Size description struct for general caches. */
	72	struct cache_sizes {
	73	size_t cs_size;
	74	kmem_cache_t *cs_cachep;
	75	kmem_cache_t *cs_dmacachep;
	76	};
	77	extern struct cache_sizes malloc_sizes[];
7fd6b141	78
dd0fc66f	79	extern void *__kmalloc(size_t, gfp_t);
871751e2 AV	80	#ifndef CONFIG_DEBUG_SLAB
871751e2 AV	81	#define ____kmalloc(size, flags) __kmalloc(size, flags)
7fd6b141 PE	82	#else
7fd6b141 PE	83	extern void __kmalloc_track_caller(size_t, gfp_t, void);
871751e2	84	#define ____kmalloc(size, flags) \
7fd6b141 PE	85	__kmalloc_track_caller(size, flags, __builtin_return_address(0))
7fd6b141 PE	86	#endif
1da177e4	87
800590f5 PD	88	/**
	89	* kmalloc - allocate memory
	90	* @size: how many bytes of memory are required.
	91	* @flags: the type of memory to allocate.
	92	*
	93	* kmalloc is the normal method of allocating memory
	94	* in the kernel.
	95	*
	96	* The @flags argument may be one of:
	97	*
	98	* %GFP_USER - Allocate memory on behalf of user. May sleep.
	99	*
	100	* %GFP_KERNEL - Allocate normal kernel ram. May sleep.
	101	*
	102	* %GFP_ATOMIC - Allocation will not sleep.
	103	* For example, use this inside interrupt handlers.
	104	*
	105	* %GFP_HIGHUSER - Allocate pages from high memory.
	106	*
	107	* %GFP_NOIO - Do not do any I/O at all while trying to get memory.
	108	*
	109	* %GFP_NOFS - Do not make any fs calls while trying to get memory.
	110	*
	111	* Also it is possible to set different flags by OR'ing
	112	* in one or more of the following additional @flags:
	113	*
	114	* %__GFP_COLD - Request cache-cold pages instead of
	115	* trying to return cache-warm pages.
	116	*
	117	* %__GFP_DMA - Request memory from the DMA-capable zone.
	118	*
	119	* %__GFP_HIGH - This allocation has high priority and may use emergency pools.
	120	*
	121	* %__GFP_HIGHMEM - Allocated memory may be from highmem.
	122	*
	123	* %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
	124	* (think twice before using).
	125	*
	126	* %__GFP_NORETRY - If memory is not immediately available,
	127	* then give up at once.
	128	*
	129	* %__GFP_NOWARN - If allocation fails, don't issue any warnings.
	130	*
	131	* %__GFP_REPEAT - If allocation fails initially, try once more before failing.
	132	*/
dd0fc66f	133	static inline void *kmalloc(size_t size, gfp_t flags)
1da177e4 LT	134	{
	135	if (__builtin_constant_p(size)) {
	136	int i = 0;
	137	#define CACHE(x) \
	138	if (size <= x) \
	139	goto found; \
	140	else \
	141	i++;
	142	#include "kmalloc_sizes.h"
	143	#undef CACHE
	144	{
	145	extern void __you_cannot_kmalloc_that_much(void);
	146	__you_cannot_kmalloc_that_much();
	147	}
	148	found:
	149	return kmem_cache_alloc((flags & GFP_DMA) ?
	150	malloc_sizes[i].cs_dmacachep :
	151	malloc_sizes[i].cs_cachep, flags);
	152	}
	153	return __kmalloc(size, flags);
	154	}
	155
40c07ae8 PE	156	extern void *__kzalloc(size_t, gfp_t);
40c07ae8 PE	157
800590f5 PD	158	/**
	159	* kzalloc - allocate memory. The memory is set to zero.
	160	* @size: how many bytes of memory are required.
	161	* @flags: the type of memory to allocate (see kmalloc).
	162	*/
40c07ae8 PE	163	static inline void *kzalloc(size_t size, gfp_t flags)
	164	{
	165	if (__builtin_constant_p(size)) {
	166	int i = 0;
	167	#define CACHE(x) \
	168	if (size <= x) \
	169	goto found; \
	170	else \
	171	i++;
	172	#include "kmalloc_sizes.h"
	173	#undef CACHE
	174	{
	175	extern void __you_cannot_kzalloc_that_much(void);
	176	__you_cannot_kzalloc_that_much();
	177	}
	178	found:
	179	return kmem_cache_zalloc((flags & GFP_DMA) ?
	180	malloc_sizes[i].cs_dmacachep :
	181	malloc_sizes[i].cs_cachep, flags);
	182	}
	183	return __kzalloc(size, flags);
	184	}
dd392710 PE	185
	186	/**
	187	* kcalloc - allocate memory for an array. The memory is set to zero.
	188	* @n: number of elements.
	189	* @size: element size.
	190	* @flags: the type of memory to allocate.
	191	*/
dd0fc66f	192	static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
dd392710	193	{
b50ec7d8	194	if (n != 0 && size > ULONG_MAX / n)
dd392710 PE	195	return NULL;
	196	return kzalloc(n * size, flags);
	197	}
	198
1da177e4 LT	199	extern void kfree(const void *);
1da177e4 LT	200	extern unsigned int ksize(const void *);
39d24e64	201	extern int slab_is_available(void);
1da177e4	202
97e2bde4	203	#ifdef CONFIG_NUMA
dd0fc66f AV	204	extern void kmem_cache_alloc_node(kmem_cache_t , gfp_t flags, int node);
dd0fc66f AV	205	extern void *kmalloc_node(size_t size, gfp_t flags, int node);
97e2bde4	206	#else
6daa0e28	207	static inline void kmem_cache_alloc_node(kmem_cache_t cachep, gfp_t flags, int node)
97e2bde4 MS	208	{
	209	return kmem_cache_alloc(cachep, flags);
	210	}
dd0fc66f	211	static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
97e2bde4 MS	212	{
	213	return kmalloc(size, flags);
	214	}
	215	#endif
	216
1da177e4 LT	217	extern int FASTCALL(kmem_cache_reap(int));
	218	extern int FASTCALL(kmem_ptr_validate(kmem_cache_t cachep, void ptr));
	219
10cef602 MM	220	#else /* CONFIG_SLOB */
	221
	222	/* SLOB allocator routines */
	223
	224	void kmem_cache_init(void);
10cef602 MM	225	struct kmem_cache kmem_cache_create(const char c, size_t, size_t,
	226	unsigned long,
	227	void ()(void , struct kmem_cache *, unsigned long),
	228	void ()(void , struct kmem_cache *, unsigned long));
	229	int kmem_cache_destroy(struct kmem_cache *c);
	230	void kmem_cache_alloc(struct kmem_cache c, gfp_t flags);
a8c0f9a4	231	void kmem_cache_zalloc(struct kmem_cache , gfp_t);
10cef602 MM	232	void kmem_cache_free(struct kmem_cache c, void b);
	233	const char kmem_cache_name(struct kmem_cache );
	234	void *kmalloc(size_t size, gfp_t flags);
40c07ae8	235	void *__kzalloc(size_t size, gfp_t flags);
10cef602 MM	236	void kfree(const void *m);
	237	unsigned int ksize(const void *m);
	238	unsigned int kmem_cache_size(struct kmem_cache *c);
	239
	240	static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
	241	{
40c07ae8	242	return __kzalloc(n * size, flags);
10cef602 MM	243	}
	244
	245	#define kmem_cache_shrink(d) (0)
	246	#define kmem_cache_reap(a)
	247	#define kmem_ptr_validate(a, b) (0)
	248	#define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f)
	249	#define kmalloc_node(s, f, n) kmalloc(s, f)
40c07ae8	250	#define kzalloc(s, f) __kzalloc(s, f)
871751e2	251	#define ____kmalloc kmalloc
10cef602 MM	252
	253	#endif /* CONFIG_SLOB */
	254
1da177e4 LT	255	/* System wide caches */
	256	extern kmem_cache_t *vm_area_cachep;
	257	extern kmem_cache_t *names_cachep;
	258	extern kmem_cache_t *files_cachep;
	259	extern kmem_cache_t *filp_cachep;
	260	extern kmem_cache_t *fs_cachep;
1da177e4 LT	261	extern kmem_cache_t *sighand_cachep;
	262	extern kmem_cache_t *bio_cachep;
	263
	264	extern atomic_t slab_reclaim_pages;
	265
	266	#endif /* __KERNEL__ */
	267
	268	#endif /* _LINUX_SLAB_H */