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 typedef unsigned __bitwise xfs_km_flags_t;
  31 #define KM_SLEEP        ((__force xfs_km_flags_t)0x0001u)
  32 #define KM_NOSLEEP      ((__force xfs_km_flags_t)0x0002u)
  33 #define KM_NOFS         ((__force xfs_km_flags_t)0x0004u)
  34 #define KM_MAYFAIL      ((__force xfs_km_flags_t)0x0008u)
  35 #define KM_ZERO         ((__force xfs_km_flags_t)0x0010u)
  36
  37 /*
  38  * We use a special process flag to avoid recursive callbacks into
  39  * the filesystem during transactions.  We will also issue our own
  40  * warnings, so we explicitly skip any generic ones (silly of us).
  41  */
  42 static inline gfp_t
  43 kmem_flags_convert(xfs_km_flags_t flags)
  44 {
  45         gfp_t   lflags;
  46
  47         BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL|KM_ZERO));
  48
  49         if (flags & KM_NOSLEEP) {
  50                 lflags = GFP_ATOMIC | __GFP_NOWARN;
  51         } else {
  52                 lflags = GFP_KERNEL | __GFP_NOWARN;
  53                 if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
  54                         lflags &= ~__GFP_FS;
  55         }
  56
  57         if (flags & KM_ZERO)
  58                 lflags |= __GFP_ZERO;
  59
  60         return lflags;
  61 }
  62
  63 extern void *kmem_alloc(size_t, xfs_km_flags_t);
  64 extern void *kmem_zalloc_large(size_t size, xfs_km_flags_t);
  65 extern void *kmem_realloc(const void *, size_t, size_t, xfs_km_flags_t);
  66 extern void  kmem_free(const void *);
  67
  68
  69 extern void *kmem_zalloc_greedy(size_t *, size_t, size_t);
  70
  71 static inline void *
  72 kmem_zalloc(size_t size, xfs_km_flags_t flags)
  73 {
  74         return kmem_alloc(size, flags | KM_ZERO);
  75 }
  76
  77 /*
  78  * Zone interfaces
  79  */
  80
  81 #define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
  82 #define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
  83 #define KM_ZONE_SPREAD  SLAB_MEM_SPREAD
  84
  85 #define kmem_zone       kmem_cache
  86 #define kmem_zone_t     struct kmem_cache
  87
  88 static inline kmem_zone_t *
  89 kmem_zone_init(int size, char *zone_name)
  90 {
  91         return kmem_cache_create(zone_name, size, 0, 0, NULL);
  92 }
  93
  94 static inline kmem_zone_t *
  95 kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
  96                      void (*construct)(void *))
  97 {
  98         return kmem_cache_create(zone_name, size, 0, flags, construct);
  99 }
 100
 101 static inline void
 102 kmem_zone_free(kmem_zone_t *zone, void *ptr)
 103 {
 104         kmem_cache_free(zone, ptr);
 105 }
 106
 107 static inline void
 108 kmem_zone_destroy(kmem_zone_t *zone)
 109 {
 110         if (zone)
 111                 kmem_cache_destroy(zone);
 112 }
 113
 114 extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t);
 115
 116 static inline void *
 117 kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags)
 118 {
 119         return kmem_zone_alloc(zone, flags | KM_ZERO);
 120 }
 121
 122 #endif /* __XFS_SUPPORT_KMEM_H__ */