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