include/linux/slab.h

   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 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 *);
  64 extern void *kmem_cache_alloc(kmem_cache_t *, gfp_t);
  65 extern void kmem_cache_free(kmem_cache_t *, void *);
  66 extern unsigned int kmem_cache_size(kmem_cache_t *);
  67 extern const char *kmem_cache_name(kmem_cache_t *);
  68 extern kmem_cache_t *kmem_find_general_cachep(size_t size, gfp_t gfpflags);
  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[];
  77 extern void *__kmalloc(size_t, gfp_t);
  78
  79 static inline void *kmalloc(size_t size, gfp_t flags)
  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
 102 extern void *kzalloc(size_t, gfp_t);
 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  */
 110 static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
 111 {
 112         if (n != 0 && size > INT_MAX / n)
 113                 return NULL;
 114         return kzalloc(n * size, flags);
 115 }
 116
 117 extern void kfree(const void *);
 118 extern unsigned int ksize(const void *);
 119
 120 #ifdef CONFIG_NUMA
 121 extern void *kmem_cache_alloc_node(kmem_cache_t *, gfp_t flags, int node);
 122 extern void *kmalloc_node(size_t size, gfp_t flags, int node);
 123 #else
 124 static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int node)
 125 {
 126         return kmem_cache_alloc(cachep, flags);
 127 }
 128 static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
 129 {
 130         return kmalloc(size, flags);
 131 }
 132 #endif
 133
 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 */