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_zalloc_large(size_t size, xfs_km_flags_t);
  61 extern void *kmem_realloc(const void *, size_t, size_t, xfs_km_flags_t);
  62 extern void  kmem_free(const void *);
  63
  64
  65 extern void *kmem_zalloc_greedy(size_t *, size_t, size_t);
  66
  67 /*
  68  * Zone interfaces
  69  */
  70
  71 #define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
  72 #define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
  73 #define KM_ZONE_SPREAD  SLAB_MEM_SPREAD
  74
  75 #define kmem_zone       kmem_cache
  76 #define kmem_zone_t     struct kmem_cache
  77
  78 static inline kmem_zone_t *
  79 kmem_zone_init(int size, char *zone_name)
  80 {
  81         return kmem_cache_create(zone_name, size, 0, 0, NULL);
  82 }
  83
  84 static inline kmem_zone_t *
  85 kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
  86                      void (*construct)(void *))
  87 {
  88         return kmem_cache_create(zone_name, size, 0, flags, construct);
  89 }
  90
  91 static inline void
  92 kmem_zone_free(kmem_zone_t *zone, void *ptr)
  93 {
  94         kmem_cache_free(zone, ptr);
  95 }
  96
  97 static inline void
  98 kmem_zone_destroy(kmem_zone_t *zone)
  99 {
 100         if (zone)
 101                 kmem_cache_destroy(zone);
 102 }
 103
 104 extern void *kmem_zone_alloc(kmem_zone_t *, xfs_km_flags_t);
 105 extern void *kmem_zone_zalloc(kmem_zone_t *, xfs_km_flags_t);
 106
 107 #endif /* __XFS_SUPPORT_KMEM_H__ */