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 static inline void  kmem_free(const void *ptr)
  67 {
  68         kvfree(ptr);
  69 }
  70
  71
  72 extern void *kmem_zalloc_greedy(size_t *, size_t, size_t);
  73
  74 static inline void *
  75 kmem_zalloc(size_t size, xfs_km_flags_t flags)
  76 {
  77         return kmem_alloc(size, flags | KM_ZERO);
  78 }
  79
  80 /*
  81  * Zone interfaces
  82  */
  83
  84 #define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
  85 #define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
  86 #define KM_ZONE_SPREAD  SLAB_MEM_SPREAD
  87 #define KM_ZONE_ACCOUNT SLAB_ACCOUNT
  88
  89 #define kmem_zone       kmem_cache
  90 #define kmem_zone_t     struct kmem_cache
  91
  92 static inline kmem_zone_t *
  93 kmem_zone_init(int size, char *zone_name)
  94 {
  95         return kmem_cache_create(zone_name, size, 0, 0, NULL);
  96 }
  97
  98 static inline kmem_zone_t *
  99 kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
 100                      void (*construct)(void *))
 101 {
 102         return kmem_cache_create(zone_name, size, 0, flags, construct);
 103 }
 104
 105 static inline void
 106 kmem_zone_free(kmem_zone_t *zone, void *ptr)
 107 {
 108         kmem_cache_free(zone, ptr);
 109 }
 110
 111 static inline void
 112 kmem_zone_destroy(kmem_zone_t *zone)
 113 {
 114         if (zone)
 115                 kmem_cache_destroy(zone);
 116 }
 117
 118 extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t);
 119
 120 static inline void *
 121 kmem_zone_zalloc(kmem_zone_t *zone, xfs_km_flags_t flags)
 122 {
 123         return kmem_zone_alloc(zone, flags | KM_ZERO);
 124 }
 125
 126 #endif /* __XFS_SUPPORT_KMEM_H__ */