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TOMOYO Linux Cross Reference
Linux/fs/xfs/kmem.h

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  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__ */
127 

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