fs/xfs/kmem.h

   1 /*
   2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __XFS_SUPPORT_KMEM_H__
  19 #define __XFS_SUPPORT_KMEM_H__
  20
  21 #include <linux/slab.h>
  22 #include <linux/sched.h>
  23 #include <linux/mm.h>
  24 #include <linux/vmalloc.h>
  25
  26 /*
  27  * General memory allocation interfaces
  28  */
  29
  30 #define KM_SLEEP        0x0001u
  31 #define KM_NOSLEEP      0x0002u
  32 #define KM_NOFS         0x0004u
  33 #define KM_MAYFAIL      0x0008u
  34
  35 /*
  36  * We use a special process flag to avoid recursive callbacks into
  37  * the filesystem during transactions.  We will also issue our own
  38  * warnings, so we explicitly skip any generic ones (silly of us).
  39  */
  40 static inline gfp_t
  41 kmem_flags_convert(unsigned int __nocast flags)
  42 {
  43         gfp_t   lflags;
  44
  45         BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL));
  46
  47         if (flags & KM_NOSLEEP) {
  48                 lflags = GFP_ATOMIC | __GFP_NOWARN;
  49         } else {
  50                 lflags = GFP_KERNEL | __GFP_NOWARN;
  51                 if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
  52                         lflags &= ~__GFP_FS;
  53         }
  54         return lflags;
  55 }
  56
  57 extern void *kmem_alloc(size_t, unsigned int __nocast);
  58 extern void *kmem_zalloc(size_t, unsigned int __nocast);
  59 extern void *kmem_realloc(const void *, size_t, size_t, unsigned int __nocast);
  60 extern void  kmem_free(const void *);
  61
  62 static inline void *kmem_zalloc_large(size_t size)
  63 {
  64         void *ptr;
  65
  66         ptr = vmalloc(size);
  67         if (ptr)
  68                 memset(ptr, 0, size);
  69         return ptr;
  70 }
  71 static inline void kmem_free_large(void *ptr)
  72 {
  73         vfree(ptr);
  74 }
  75
  76 extern void *kmem_zalloc_greedy(size_t *, size_t, size_t);
  77
  78 /*
  79  * Zone interfaces
  80  */
  81
  82 #define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
  83 #define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
  84 #define KM_ZONE_SPREAD  SLAB_MEM_SPREAD
  85
  86 #define kmem_zone       kmem_cache
  87 #define kmem_zone_t     struct kmem_cache
  88
  89 static inline kmem_zone_t *
  90 kmem_zone_init(int size, char *zone_name)
  91 {
  92         return kmem_cache_create(zone_name, size, 0, 0, NULL);
  93 }
  94
  95 static inline kmem_zone_t *
  96 kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
  97                      void (*construct)(void *))
  98 {
  99         return kmem_cache_create(zone_name, size, 0, flags, construct);
 100 }
 101
 102 static inline void
 103 kmem_zone_free(kmem_zone_t *zone, void *ptr)
 104 {
 105         kmem_cache_free(zone, ptr);
 106 }
 107
 108 static inline void
 109 kmem_zone_destroy(kmem_zone_t *zone)
 110 {
 111         if (zone)
 112                 kmem_cache_destroy(zone);
 113 }
 114
 115 extern void *kmem_zone_alloc(kmem_zone_t *, unsigned int __nocast);
 116 extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast);
 117
 118 static inline int
 119 kmem_shake_allow(gfp_t gfp_mask)
 120 {
 121         return ((gfp_mask & __GFP_WAIT) && (gfp_mask & __GFP_FS));
 122 }
 123
 124 #endif /* __XFS_SUPPORT_KMEM_H__ */